plate no. 9958

La Bella Principessa - Portrait of Bianca Sforza

ink, gouache, vellum, woodHigh Renaissanceportraitportraitfigurehairdressprofileheadpiece

recreation guide

La Bella Principessa is a High Renaissance portrait attributed to Leonardo da Vinci, executed around 1498. The work is distinctive for its medium: it is painted in ink and gouache on vellum, mounted on wood. Unlike Leonardo’s more famous oil paintings on panel, this piece utilizes the opaque qualities of gouache (also known as body color or guazzo) to achieve a matte, solid finish that differs from the transparency of standard watercolor (Source 1). The artwork exemplifies the artist’s mastery of subtle modeling and smooth surface blending, characteristics often associated with his sfumato technique, where brushstrokes are rendered indistinguishable to create a soft, shadowy quality (Source 8). The use of vellum as a support is consistent with the tradition of illuminated manuscripts and miniatures, where gouache was frequently employed for its opacity and ability to form a superficial layer over the support (Source 1, Source 7).

estimated time

40-60 hours over 8-12 sessions

materials

6 items

steps

6 in sequence

materials

item	purpose	modern equivalent
Vellum	Primary painting support, providing a smooth, non-absorbent surface suitable for opaque watermedia.	High-quality calf skin vellum or synthetic vellum paper
Wood panel	Rigid backing to mount the vellum, preventing warping and providing structural stability.	Hardwood panel (e.g., poplar or oak), sanded smooth
Gouache (Body Color)	Opaque water-based paint for modeling forms and applying solid color layers.	Professional-grade opaque watercolor or gouache tubes (gum arabic binder)
Ink	For linear definition and underdrawing, as indicated by the medium description.	Iron gall ink or high-quality black drawing ink
Gum Arabic	Traditional binding agent for pigments, ensuring adhesion and flexibility on vellum.	Pure gum arabic solution
White filler (e.g., Chalk/Chinese White)	To increase opacity and reflective qualities of the paint, essential for the gouache technique.	Titanium white pigment or pre-mixed white gouache

preparation

surface prep

The vellum must be mounted onto a wood panel to ensure rigidity, as vellum can warp with humidity changes. The surface should be cleaned and possibly sized with a dilute gum arabic solution to prevent excessive absorption while allowing the gouache to adhere. Leonardo’s practice involved meticulous preparation; while specific sizing recipes for this piece are not detailed in the sources, the use of vellum implies a need for a stable, smooth ground that supports the opaque nature of gouache without bleeding (Source 1, Source 5).

underdrawing

The medium list includes 'ink,' suggesting a linear underdrawing phase. Leonardo likely used fine ink lines to establish the composition and contours before applying paint. This aligns with the general practice of using ink for precision in miniature and manuscript traditions (Source 7). The underdrawing should be light enough to be covered by the opaque gouache but precise enough to guide the modeling.

underpainting

Gouache is typically applied opaquely, so a traditional transparent underpainting (like grisaille in oil) is less relevant. However, the artist may have established tonal values with diluted ink or thin gouache washes to map out light and shadow before building up opaque layers. This approach leverages the 'quick coverage and total hiding power' of gouache (Source 1).

color palette

Flesh Tones

Lead white, vermilion, ochre, and black (historical); modern equivalents: Titanium white, cadmium red, yellow ochre, ivory black.

Modeling the face and hands, utilizing the high pigment-to-binder ratio of gouache for smooth transitions.

Deep Blacks/Dark Browns

Iron gall ink or lamp black mixed with gum arabic.

Hair, eyes, and deep shadows, providing contrast against the lighter vellum and flesh tones.

Jewelry Accents

Gold leaf or yellow ochre mixed with white for highlights.

The intricate jewelry and headdress, requiring the 'brilliant, intense colours' mentioned in contrast theory (Source 2).

Background Neutrals

Gray or sepia washes.

Creating a subdued backdrop that emphasizes the figure, consistent with Leonardo’s 'subdued colouring' (Source 8).

composition

The portrait features a three-quarter view of the subject, a common convention in High Renaissance portraiture. The composition likely emphasizes the face and hands, with 'unadorned dress' allowing the viewer to focus on the expression and modeling (Source 8). The background is likely neutral or subtly modeled to avoid distracting from the figure, consistent with Leonardo’s tendency to use dramatic or subdued backgrounds to enhance the subject’s presence (Source 8).

step by step

underdrawing→first pass→refining→finishing

underdrawing

step 01
Mount the vellum securely on the wood panel. Using fine ink, sketch the basic proportions and contours of the face, hands, and jewelry. Ensure lines are precise but light, as they will be covered.
Tip — Work slowly to avoid tearing the vellum. Use a sharp pen or fine brush.
Linear Underdrawing

first pass

step 02
Apply thin washes of diluted gouache or ink to establish the basic tonal values. Map out the light source and shadow areas. This step utilizes the water-soluble nature of the medium to create initial depth.
Tip — Allow each layer to dry completely before adding more to prevent muddiness.
Wash Technique

refining

step 03
Build up opaque layers of gouache to model the forms. Use the 'high ratio of pigment to binder' to achieve solid coverage. Blend carefully to eliminate brushstrokes, aiming for the 'extremely smooth nature' characteristic of Leonardo’s work.
Tip — Gouache dries lighter or darker than when wet; test colors on a scrap piece of vellum to match tones accurately (Source 1).
Opaque Modeling
step 04
Focus on the face and hands. Use subtle gradations of tone to create the 'sfumato' effect, where shadows blend softly into light. Avoid hard edges unless defining specific details like jewelry.
Tip — Use a dry brush to lift paint or blend edges gently. The goal is to make brushstrokes 'indistinguishable' (Source 8).
Sfumato

finishing

step 05
Add final highlights and details to the jewelry and eyes. Use the 'brilliant, intense colours' for accents to create contrast against the subdued background and flesh tones.
Tip — Be cautious with wet-on-wet techniques on vellum, as it can cause buckling. Work in small areas.
Detailing
step 06
Inspect the painting for any visible brushstrokes or uneven tones. Make final adjustments to ensure the 'matte finish' is uniform and the image has the 'lively' quality described in Leonardo’s portraits.
Tip — Gouache can be rewetted, allowing for corrections, but overworking can damage the vellum surface.
Final Review

critical techniques

Gouache Opacity

Using the high pigment-to-binder ratio and white fillers to create solid, opaque layers that cover the underdrawing and previous washes. This allows for direct painting and correction.

Sfumato

Blending tones so smoothly that transitions are imperceptible, creating a 'shadowy quality' and 'lively' appearance. This is achieved through careful layering and softening of edges.

Color Contrast

Using the 'law of simultaneous contrast' to enhance the vibrancy of colors by placing complementary tones adjacent to each other, particularly in the jewelry and facial features.

common pitfalls

→Gouache dries to a different value than when wet, which can lead to mismatched tones if not tested beforehand (Source 1).
→Overworking the vellum surface can cause tearing or buckling, especially when rewetting areas for corrections (Source 1).
→Failing to blend brushstrokes can result in a visible texture that contradicts the 'smooth nature' of Leonardo’s technique (Source 8).
→Ignoring the 'simultaneous contrast' of colors can lead to dull or inaccurate color perception, as the eye is susceptible to fatigue and complementary afterimages (Source 4).

what the sources don't tell us

Where the corpus is silent, we say so rather than guess. These are the gaps a complete recreation guide would normally cover that our source passages don't.

·Specific pigment recipes used by Leonardo for this particular work are not detailed in the sources.
·The exact method of mounting the vellum to the wood panel (adhesive type, tensioning) is not specified.
·The specific composition details (e.g., exact jewelry design, facial expression nuances) are not described in the provided sources, relying instead on general knowledge of the artwork.
·The role of ink in the final image (whether it remains visible or is fully covered) is not explicitly clarified.

grounded in

The technical procedure in this guide traces to the following classical art-instruction texts.

Laws of Contrast of Colour↗
- 442. Among the harmonies of contrast of tone — applied to Guidance on using color contrast, particularly with bright accents against darker backgrounds.
- 315. As to the advantages the painter will find in it — applied to Understanding simultaneous contrast and its impact on color perception during painting.
The Practice of Oil Painting↗
- ON COPYING — applied to General advice on copying works to improve technique, though less directly applicable to the specific medium.

cross-referenced from

Named facts about this artwork and artist were checked against these reference pages.

Wikipedia: Gouache↗
- Gouache — part 1 — applied to Understanding the properties of gouache, its opacity, drying behavior, and suitability for vellum.
- Gouache — part 2 — applied to Historical context of gouache use in manuscripts and miniatures, supporting the medium choice.
Wikipedia bio — Leonardo da Vinci↗
- Leonardo da Vinci — part 16 — applied to Insights into Leonardo’s sfumato technique, smooth blending, and subdued coloring.