A persons eyes all the way. You can read so much into somebody by their eyes. Their eyes are like a gateway to their souls I swear. I usually fall for a girl based purely on what I sense about her looking into her eyes. I know it sounds silly but I have a scary judge of character just from looking into a girls eyes.
Face. Nothing in particular, just the face in general. Not really the eyes (at least not at first). I obviously notice the clothes, but that doesn't mean I care about them. I just notice them. What I care about, if I'm just focusing on looks, is her face. Actually, also her hair.