"finger winding"? that would make me laugh because its a bit weird sounding!
Your hair looks gorgeous today is probably more fitting!
Just say what you really feel, and try to be yourself. In time when someone gets to know you they will realize if you were being a bit fake to who you truly are.
Compliments are always good. But don't go over the top. Looking in to their eyes and saying you think there eyes are so beautiful can really flatter a girl. And its nice to notice when she makes an effort with her clothes hair make up ect.
If she says something you think is funny just laugh naturaly. Don't try to hard to be or feel something you are not. Its quite obvious.