Here’s a quick guide to the color zones of the face. At least, this is how it breaks down at the most simple level. The yellowish forehead may not be as noticeable on darker skinned characters, but you can play with it and see what works. It can get more complicated than presented here, but this is a solid starting point.
For more resources on drawing, check out some of my favorite art instruction books: https://brian-shearer.com/2021/04/5-art-instruction-books-that-will-help-you-improve-immediately/
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