I'm your average American, a mutt of just about everything. What am I most attracted to? Black women. Never had much interest in anything else unless personality alters that. But OP said 'physically', so.. the three most obvious things I like are: the woman be at least a few inches shorter than me, the shorter the better, and I'm 5'8". I also like the biggest butt I can find, but not if the girl is big too. I'm the kind of guy who likes A in the front and D in the back.
My ancestry is French, Italian, Portugese, German, Irish, Scottish and Brazilian, and the ethnicities within are African (ancient, not within 10 generations at the least), Caucasian, and Hispanic. Figured it might be a good idea to say all that so people know what I am and attracted to.
The complexion I really like is a good darkness, not dark as midnight, but dark. Dark like.. Naomi Campbell or darker. Though, I do like looking at women of other races too, like a white girl with freckles just below her eyes on her cheekbones, or Indian women (not Native) because I really like the darkness of their skin around their eyes. The most beautiful woman I've ever seen, and everyone else who knew her agreed on her beauty, was from Tonga.
Summarized though, I'd say I'm mostly attracted to women that aren't my own race, because I think of my race as rather vanilla, and I don't want to be bored, so I want to find someone who looks interesting. Any of that helpful to OP?