Honestly, one of the best tips I've ever been given for coming up with various skin tones is to find a makeup company with a huge shade range of foundations, and find their color samples chart. This doesn't give you highlight/shadow colors, but they are usually engineered to pretty closely replicate human skin colors.
This is the shade range from IT cosmetics, for example:

(I did not select that one shade on purpose, it was just selected when I took the screenshot.)