I think an 'average' white girl is more attractive than an 'average' black girl. Don't waste your time posting pictures of attractive black girls, I know there are loads of attractive black girls, but when you're dealing with an entire race, you have to deal with averages, and, personally, I'm a white man and I find white girls more attractive.
EDIT: Neg me if you like, but disagreeing with my sexual preferences for white girls because you think it's racist is akin to disagreeing with a man's sexual preferences for other men because you think it's sexist. It's absurd.