Batone with the lamp

Lightly sketch the basic shapes and proportions of the figure and background.

Establish the darkest and lightest areas with thin washes of paint.

Gradually build up the mid-tones, paying attention to the direction of light.

Define the details of the face, hands, and clothing with thicker paint.

Add highlights to the lamp and beard to create a sense of luminosity.

Refine the background and add subtle variations in tone.

Pay attention to the edges, softening some and sharpening others.

Add final touches and adjust values as needed.