Okay, disclaimer aside, common non-verbal signs of interest include:
smiling with eye contact
casual touching like her hand on your arm
mirroring (when your and her body languages mirrors each other this often happens unconsciously both people lean or sit the same way)
I've heard the people's feet often give away how they feel, for example are feet pointed toward you or at the door?
Moistening lips and touching hair or accessories are good signs
So, did you ask/are you going to ask if you can see her again?
Ultimately if she is interested enough she will want to see you again....
Seriously, all this stuff about women moistening their lips and flipping their hair...it's depressing. Do you know, I don't think ANY woman's ever done that with me, including the one who married me. How deprived should I feel?
1. Direct my body toward him, if we are side by side and I am typically angled in his direction.
2. Eye contact. I saw a movie or something once where they said knowing someone's eye color is a sign of love. I make sure he has the opportunity to notice my eye color.
3. I am a big fan of gentle touches. I will touch his arm when I laugh. I will touch him when talking to him. Nothing Prolonged, but light quick taps or touches.