I have seen beautiful and intelligent woman infatuated with guys who look like a cross between Quasimodo and Mr Hyde. Girls seem to be most attracted to guys who seem self assured. So, don't hunch like a beaten dog and act like nothings going your way. Also, don't act or pretend to be something you aren't or don't want to be. Girls are humans after all, so imagine how you would react if some random guy started rambling and boasting about his skills or life. Above all, I always hear girls say that they want to feel needed like a part to a puzzle. So act like you enjoy their company and are listen to what they are saying.
Lots of good advice here:
http://www.artofmanliness.com/
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"Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth." - Marcus Aurelius