I look at their hair first, I like the long flippy hair lol, then I look at their height, I love tall guys, then I look at their eyes, I love love love pretty eyes!, then I look at their clothes, shoes, then I see if they have any kind of muscles going on haha .... and that's about it.
Most girls just look quickly taking it in at one glance. Most girls like nice eyes or teeth. I say pick him for his personality and how he treats you. He can have an outwardly ugly face with the heart if an angel.
It's not always physical. My wife told me the first thing she noticed about me was my initial. Her maiden name started with a W and she said that, as a child, she spent so much time at the back of alphabetical queues that she'd have taken ANYBODY with an initial in the first half of the alphabet.
His handsomeness, if he is to handsome I will completely avoid him because you know he has issues. Not that he brings it on himself but it is forever present and I would rather be the one in the relationship with issues, so he should be "kinda good looking".