I've studied the behavior of PUA, and here's what I found. No PUA look for eye contact, or body language. All the ones I've seen will spot an attractive woman, and walk over to her and try to talk to her. Most of the time, the female will not acknowledge the PUA's existance. PUA approaches from behind, and the side. The majority of the time they will startle the female. Normal men will wait for some kind of acknowledgement before approaching.

Secondly, PUA's are rigid in their methods. PUA set specific times to do approaches. For example, Thursdays from 1-3. If PUA see a female who might be interested on Friday, PUA just ignores the female because it's outside his "business hours".

Those are the two main differences I've noticed