To balance out a round face shape, we need an uneven cut with mixed layers of different length as well as a deep side part or side swept bangs that would be able to create more volume and add depth on the top part of the head without emphasizing width.
We can also create a vertical line using tresses around face where the hair starts to swoop and thins a round face. There’re still other ways like making lots of attractive volume curls at the sides to soften the face line and cutting a straight-across fringe to narrow the roundness. All what we are doing is to avoid the focus of your widest part – the cheekbones as round shaped faces need hair styles that slim the face.
Generally, a side part would break up the center line of your face. But if you want to want to wear a center part, the way to make it work for a round face is to have your hair slightly longer than your shoulders with layers that hit at the jaw. The best ponytail for a round face is one that’s higher up at your crown to elongate a round face.