I'd say having long hair is a must, as anything shorter than my hair freaks me out. But that's not an odd feature, just that the opposite I dislike.
I'd say I like it when girls are short and skinny. That just sounds odd, but there are a few girls I have known that are very petite in size that just drive me crazy horny.
But back to hair. For starters brunettes drive me wild, but I can like all 4 primary hair colors. A blonde with curly hair out in the snow covered in snowflakes? Awesomesauce. Hair plays a huge, HUGE part in how attractive I find a woman, but not in a fetish "I wanna sex your hair" way.
Going opposite of the petite example, sometimes I want a girl with some meat on her. Somebody I can wrap my arms around from behind and feel a warm embrace or something like that. It's hard to describe anything I find attractive. Plus along with a girl who isn't a twig comes larger breasts and ass, and it's about balance. Not that I look for larger women, it's just not a turnoff in comparison. Plus they are fun to cuddle. Well, that can be said about a lot of people.
Now, I couldn't go through all this perving out on women without going through what I find attractive in guys. The trail of hair underneath the belly button is wildy attractive. Also just looking effeminate in general is a turn on. Soft eyes, lean, and back to the hair. A lot of girly emo hair on guys looks good. And there's something about Ashton Kutcher that I like. My taste in guys is intricate, only a small percentage I would want a relationship with.