Hey guys, honestly, give her a sweet smile, say hi and go from there. No, not a come-hither-slimey-I-want-you-in-my-porno smile. Just a nice-sweet-guy-next-door smile. Oh, and no cheesy pick up lines either! Instant turn off!
Direct and self confident smiles always work for me. Actually self confidence is really sexy, but just don't act like you own the place, just confident in yourself. BTW, a little shy is ok too. Sometimes it's really cute.
Especially with the smile!