Think about it from a perspective of an average SINGLE girl if you can, not just your own personality. Also try to look at it in different situations. Example, next time I go visit my friend at her college, she has a friend that I want to know better but if there isn't good conversing time then I want to at least get her attention through eye/smile-flirting.
Most Helpful Girl
If said single girl is interested in you and you make eye contact and smile then it won't be as creepy as it is exiting. Just make sure you don't just randomly stare at her and star away, smile look happy and make it obvious that you're interested.1