Best hairstyles for round faces?

Okay so I have a round face, but I want a change in my hairstyle. I have done the hair at every length imaginable. It really doesn't matter what length it is as long as it flatters my face. With having a round face, it can look too round at times. What are the best bangs, amount of layers, types of layers, and lengths for my hair?? Right now I have a bobish look that is right above my shoulders. I like it, but it makes me look kind of young. I am not really going for that, so help please. Just any help! Would some kind of straight bang look okay? Just any ideas! Maybe pictures, too?? Thank you! :)