There’s nothing more annoying than having a stage-fiver on your back when looking at a piece of art. If the girl seems genuinely un-interested, let it go. If she’s with a group of girlfriends, and just wants it to be “the girls,” don’t linger around. The last thing you want is to come off as the “creep.” If you're talking to a girl, and she clearly isn’t interested, you have to know when to quit. Show her you're there for the same reasons she is: to enjoy a night at a gallery looking at the art.