I have heard from multiple people that eye contact is essential in letting a girl (or guy, I guess) know you’re interested.
But what is the 411 when it comes to said eye contact? Do you keep looking until she does? Do you then keep staring? Or is like looking at the sun? What’s the deal?
Very cultural dependent. I’ve been quickly recognized as an American because we tend to smile with our teeth exposed more often than other cultures.