How to Paint Dark Skin Tones
Burnt umber is the base for darker skin tones. To that mixture I add cadmium red light and/or cadmium orange along with a some raw sienna. In the shadows, I often add ultramarine blue, perylene maroon, or ultramarine violet in the shadows.
Here is an example of a quick sketch that uses burnt umber, cadmium red light, raw sienna, and ultramarine blue. There may also be some perylene maroon in the shadows.

African American Skin Tone
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