Also another thing that helped me when I starting out drawing in color, and I still use this to help me today, is to look at how other artists render what I want to draw. Of course, don’t let it discourage you, this is just meant to inspire. Doing studies of old paintings really helped me learn things that were difficult to draw at first.
This blog has some really get resources for darker skintones btw so I’ll link it to you, I hope you find it inspiring. I certainly use a lot of inspirations from other artists, there’s just so much cool art out there.
I used this old painting and broke it down to take away the colors he used for the skintone. He uses actually just straight up black it looks like for some of the darkest colors. But there’s also a great deal of highlighting, but just have fun with your art right now! You’re starting out with digital so just experimenting helps the most. Sometimes the things turn out and sometimes they don’t but that’s just the learning process :’) Still, it’s really fun to get our characters down on paper … or tablet 
I apologize for always writing novels
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https://blkwomen.art/post/677389093139791872/nubian-beauty-tobias-andreae-german-18231873