Hi Dave,
Some good questions and important too, as body language is a fundamental aspect of attraction.
- If a girl is playing with her hair while talking to you or looking at you then that is an indicator of interest.
- If she is puffing out her chest and "displaying" herself and she is pointed in your direction then that is an indicator of interest.
- If she makes eye contact with you, then breaks it away, then that could also be an indicator of interest and possibly means that she is shy as well.
Now, be careful how you interpret these, as it could be that she is "displaying" herself not for you in particular but to garner general attention from all males. You'll know if body language is intended for
you if her body is pointed towards you or if she is consistently looks at you.
Hope that helps.