Shoulder-length hairstyles are universally flattering on all face shapes. This casual style looks great on actress (and naturally round-faced) Olivia Munn.
The last thing you want to do if you have a round face is add fullness to the sides of your head. If you have naturally wavy or curly hair, cut in layers to weigh it down and make sure to grow it a couple inches or more below your chin.
More on this hairstyle: