It's usually their presence and the little gestures, not so much physical features because I can find someone physically appealing and not feel any attraction at the same time.
Other than the way they carry themselves, there’s something about their hands that I find hypnotic. Their placement when someone is talking. Their placement when they’re talking. Whether it offers a shake of the hand if they encounter someone they know and the grip given or being used to help them gently but efficiently make their way through a crowd. Then there’s the slight focus upwards to the watch on their wrist and the visible strength of their forearms. But that’s a whole other thing.
I would say in the first milliseconds I see a woman some part of my brain which does its own thing is classifying her as my type or not my type based on body type, face and relative friendliness, in that order. if a woman seems unfriendly no matter how physically esthetic she is I lose immediate interest.
