That's almost for the best. The representation of non-European ethnic facial features / skin tones in renaissance art appeared to mostly be one of two groupings:
1) Accurate, naturalistic portrayals that almost certainly had an actual human sitting and;
1) Accurate, naturalistic portrayals that almost certainly had an actual human sitting and;
2) Color choices / features that are to humans of other skin tones, what that picture of a cat in the still life painting is to our feline friends: https://twitter.com/chelsesaurusrex/status/99512793958585139...
There are some really interesting examples in this article (although explicitly African):
https://thewalters.org/wp-content/uploads/revealing-the-afri...