i've got a round face as well and have gotten a few cuts that made my face look smaller and some that just made it look even more round!
- short curly hair isn't a good idea, but long is
- if you wanna go short, do shoulder length wavy hair
- another short style is a bob that's short from the back but comes around long on both sides
- if you wanna do bangs avoid straight bangs, swept side bangs are good
- curved bangs go quite well (where it's shorter in the middle but longer on the sides) with long straight hair
google some pics for more inspiration :)