I'm not very picky but I find that I'll overlook things if a guy has thick (but perfectly shaped) eyebrows and great cheekbones/jawline. I also prefer guys with dark hair. Or a blonde guy with dark eyebrows. It's weird, I know.
I think it's easier to say what I'm not attracted to and that's guys with bad teeth, no chin (or too many) and thin hair/poor hairlines (because that's a sign they will bald young).