Body Language of Women Flirtations:

Pay attention to your look. Women interested in you not only look but also you will let you know it while doing so. Repeated eye contact across a room is a clear indication that you want to greet you near, especially if also smiles.
Look at his face. The face of women tends to be more animated when they are interested in you. Pay attention to your eyebrows, lips and eyes to see how it reacts to your words