In order of power over me:
1) Eyes - the light, intelligence, humor, and level of arrousal they reveal.
2) Smile - lips are certainly a big part of this, and full lips are very attractive. A slightly crooked smile is a huge turn on, as it often indicates intelligence, humor, and perhaps a sarcastic wit.
3) Hair - I am hopelessly attracted to two very different kinds of hair on a woman's head. A) very short, B) very full, long and dark.
@latinabella is a good example of the latter, as is Jenni of
www.jenniselfies.tumblr.com. The model Stefania Ferrario is a good example of the former. You can find Ms. F. scattered throughout my homage to nude, short-haired women:
www.nudegals-shorthair.tumblr.com
4) Breasts, hips, legs - down to the purely physical, I love curvy women.