i want to add my voice to what ClawShrimp said.  there's a certain very African (and often African-American) look that i've never been able to acheive in a figure because there are no morphs for the back of the head.  actual skull shape can do a lot.  and yes, use references.  because mostly what we think we see isn't actually what's there.  and it's even worse if what we're trying to depict is less familiar.