Like others I go for personality above all else, but seeing as how this asks for what you like in a girl on a looks basis I'll post my opinion the hottest girl I can imagine in my head. This doesn't make me shallow, because I'm not, but this is like me posting my dream girl.
Eye color: Green
Hair color: Black or something dark
Hair length: Long enough to put in a pony tail and look good, but not passed upper-mid back. Hair down is better than up though..
Smile: Gotta be beautiful
Boobs: Doesn't matter
Ass: Gotta be nice..hmm..something along the lines of slightly ghetto booty, but not fat. Like those hot thin chicks with asses that don't fit them. J-Lo for instance.
Weight: Proportional to their height. A few pounds under is ok, but not that great. A few pounds over isn't bad at all.
Height: Anywhere from 5'3" - 5'8"
Waist: Hmm..well..gotta match an average build with a nice ass..so..size 3-6
Hmm..yes I'm wierd so she has to have nice hands too. Legs too I guess.
See now that is my DREAM GIRL.
When it comes to reality:
Nice smile/eyes..not TOO fat or TOO thin..anywhere in between (yes "chubby" is allowed).
Asian chicks own too. Ugly ones do not exist.
Any foreign chick has a certain hotness factor to them.