Flirting Advice for Dating - Joel David - Bog

Understand why you are flirting.
A person engages in flirting, which is lighthearted in nature, to show another person that they are interested in them on a romantic or sexual level. There are subtle flirtation techniques as well as occasionally overt flirtation techniques. You can flirt by making eye contact, displaying body language, making physical contact, changing the tone of your voice, or any combination of these actions.
Keeping eye contact longer.
Lengthening your gaze can convey interest in someone, whether you are speaking with them or just observing them from a distance. But keep in mind that sustaining eye contact should only be done to a certain degree.
Don't go overboard because that could make her uncomfortable, particularly if you are staring at someone else across the bar.