Portrait of Pope Innocent X

surface prep

The canvas should be prepared with a ground suitable for oil painting. While specific priming recipes for this exact work are not detailed in the sources, traditional practice involves a stable ground to support the oil layers. Ensure the surface is smooth enough to allow for the 'filmy' brushstrokes mentioned in Velázquez’s technique, but textured enough to hold 'thick' impasto where needed (Source 4).

underdrawing

Begin by sketching the subject onto the canvas using charcoal or thinned paint, as is traditional in oil painting (Source 2). Velázquez’s later style was characterized by bold brushwork, suggesting the underdrawing may have been loose and integrated into the first paint layers rather than a rigid outline. Avoid being 'too tied down to your outline,' as copying Velázquez helps correct this tendency (Source 1).

underpainting

Apply an initial layer of thinned paint (lean) to establish values and composition. This layer should dry completely before proceeding. The 'fat over lean' rule dictates that this first layer must contain less oil than subsequent layers to prevent cracking (Source 2).

Fat over Lean

Each additional layer of paint must contain more oil than the layer below to ensure proper drying and prevent cracking. This is a basic rule of oil paint application (Source 2).

Varied Brushwork

Velázquez used a variety of brushstrokes, rough or smooth, filmy or thick, to achieve a sensuous depiction and atmospheric depth, distinct from Caravaggio’s unvaried sheen (Source 4).

Atmospheric Rendering

Instead of sharp, unvaried chiaroscuro, Velázquez achieved spatial depth and a fluid handling of light and shade, creating a more lifelike and expressive image (Source 4).