This my basic sketch for the face. It took about 2-3 minutes to make.
It's good to choose at least 3 swatches. One for light areas, the base tone, and the shading colors. For my shading, I chose warm reds. Any color can be used, though. Experiment with purples and blues if you can!
On a layer underneath the line art, fill in the face with your base color.
Using the shading color one tier below your base, paint the areas according. My light source is coming from the front and a bit from above, so I focused on underneath the eyebrows, strands of hair covering parts of the face, the neck, the nose, and the area below the bottom lip.
Now go down your tiers of shades in order, using less of them to define the face as you get darker. I used my darkest shade to show the crevices of the eyes, nose, and mouth, and to further define where the hair sits on the face.
Shoot right on back to the light tone you've been saving. It's usually important to use a touch of the light tone on the apples of the cheeks and the bridge of the nose, just to look more 3D.
If you want, you can go even more intense with the light areas. Again, I defined more of the nose and added very small spots of white to the cheeks
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