That glance is the first step in learning how to flirt.
What makes that glance or that look a flirting technique or signal, if you will is that it lasts longer than your average eye contact with another person. This is the first indication that there may be interest between two people.
The next step in how to pick up women is to watch carefully what the woman does after that initial, prolonged eye contact.
After you exchange glances, watch her head and eyes. If she looks slightly down and away, she is interested. Being able to read someone else's body language is a key component of learning how to flirt. If you talk to other guys who are successful in picking up women, you will see how important the correct reading of this one gesture is.
Of course the alpha male instinctively knows this. Or so it seems. But really what appears as natural charisma is not necessarily so. You better believe that only a small handful of men were born with this natural ability. The others have learned the first step in how to flirt by studying basic pick up artist introductions. This lets them approach that woman whose glance has lingered invitingly.
What happens when you approach the woman is the next step.
When a man decides he wants to meet women, he can also start by studying dating advice, self improvement books and health and fitness advice, which is always helpful. Along with studying online and published advice, he should find a local wingman. This person will go out in the field with him and teach him how to approach women.
This wingman can also share field reports on what has worked in past encounters and what hasn't worked. This is valuable advice.
Once you engage the woman in conversation you must pull out all your tools on how to flirt.
One thing to remember is this contact should almost always be fun. Women want to be around people who are fun and even playful. Gentle teasing is a great method of flirting. Despite what some pick up artists say, putting a woman down is never a good idea.
Part of showing a girl some fun can involve making her laugh. This can be done with funny pick up lines, but also by having a few magic tricks to attract women up your sleeve.
Sometimes, a part of practicing how to flirt involves complimenting the woman, but be sure that when you compliment you are commenting on something that you see she has done to make herself more attractive. For instance, instead of commenting her on the color of her eyes (something she was born with) - compliment her on the way she matched her scarf to her eye color perfectly.
This is a sincere compliment that acknowledges something besides how she looks. It is more real and more effective. Remember when learning to flirt, it is an ongoing process that needs to be tailored to each individual situation.