What does it mean when guys pick out things about a girl that they notice?

Anonymous
I have a friend that used to be all touchy touchy and flirty && he always seems to notice things about me. For example, the other day he seen me and I waved. He's like why do you do that? I'm like what? He's like you tilt your head, wave high, and get on your tippy toes a lil. I highly doubt he likes me for the simple fact he always talks about girls and how picky he is. Trust me, I'm not skinny. I'm a cute face chubby girl kinda chick.

Anyways, My question is, do guys notice things about a girl just because or they find them attractive in some sorta way?
What does it mean when guys pick out things about a girl that they notice?
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