I want to know how girls flirt from afar, like looking at you or something?

It depends on the girl. Bold girls will stare at you and wait for you to notice so they can talk to you. They may just come up to you and start a conversation with you. Shy girls will stare at you when the think your not looking and if you catch them they will either look down real fast or play it off like they were looking at something else.

Personally, I'm on the shy side. I really like a guy in my art class and there's a mirror right by me so I can look at the mirror from the corner of my eye and see him without even turning my head.

Most girls figet around a guy they like. Pulling/ messing with jewelery and clothes, fixing hair, applying chapstick or lipgloss, just playing with items around them (for me a paintbrush in art), etc. It's subconcious for the most part.

Metaldave20 is right. When I flirt with a guy from "afar" I usually look at him. If I see that notices me I hold his gaze for a few seconds but then look down, somewhere else, or at my phone. Smiling too. I always smile at guys that I think are cute. [= Also in the dining hall, I will walk make sure that I walk past his table - in hopes that he will notice me. Look for little things like this. If you see them definitely go introduce yourself to her or say hi to her the next time you see her. She may be afraid/nervous to approach you.

They just look at you. Usually they smile. You might see them putting on lip gloss or fixing their hair because they want to look good for you.

And if the girl is bold, she'll wiggle her fingers at you.

That's what I do anyway...lol