I have found when flirting the best thing is to openly ridicule the other person.
Actually some good tips though. Minus the stupid sketches.
People pick up on subtle body language. A good way to show interest is to lean in, but don't get freaky with it.
Hair tossing.. since I am not a guy I cant verify that. It's always been a pet peeve of mine.
Girls don't act stupid or slutty. That's my 2 cents.
I'm charming. :)