Round Face - Your face is as wide as it is long. This may vary a little but generally the measurement is close.
Try and create the illusion of length to the face, this will make the face appear slimmer.
Avoid- Chin length hair with a rounded line that mirrors face’s round shape. Center parts tend to accentuate roundness. Also avoid styles with short-short crops, or straight "chopped" bangs. Fullness at side of ears also accentuates the round shape. A rounded haircut ending at the chin will certainly add weight to your already round face shape. Because the widest part of your face is at the cheeks and ears, you need to avoid having the fullness of the cut here, as it will make your face appear wider.