Unless you want to get into finer minutaie like other stereotypical markings like heavy eyelids or thick lips, I think the skin colorations available to humans in the game are fine. Not that many people actually make non-white humans, mind you, but the opportunity is there.
Maybe it's not like, say, Morrowind/Oblivion where the black people have their own "race" and highly athletic people. (Or Everquest, where the black people are the skinny intelligent casters.) But, from the perspective of a white person, it doesn't seem to me like the game is horribly biased...but again, that's from the perspective of a white person.