When it makes out to flirt, you can make your signal across very easy just using your eyes. Get a moment and find people who are in lovemaking. Look how they look at each other - they stare at once into each other's eys for grand periods of clock time. Look at mere friends. See their eyes? They appear to flit back and forth, making eye contact, but never lasting eye contact.
What do I average by extended eye contact? Holding someone's gaze for 1-2 seconds. Looking At extended into their eyes for that time. I realise that couples may see at each other in this style for longer flows of time, but think they are Granted to do this - they are a couple. For our determinations, you are only playing.
If you were to effort and stare into any girl's eyes for extended periods of time (especially if you don't know her), she will think that you're agaze at her and she'll suppose that you're strange (because you're readying her feel uncomfortable).
The goal present is to have eye contact with her, and to hold up her attention by seeing direct into her eyes for a match of seconds so that she catches the mind that you're concerned in her.
Be sure to grin, or to at least have a partial smile on your cheek as you do this. If you stare at her like this with a stone face, you'll nut her outside. She'll either guess that you're mad at her, or that you're just rare type of psycho (both are bad).
If she appears to quickly see outside, she is either acting awful to make, or she doesn't get an interest in you. Either manner, if you feel that she's deserving the effort, you will likely have to persue special decent conversation with her.