If you are sure you have a round face then it needs to be taken into consideration when you choose a suitable hairstyle to wear. Round faces seem to do better with short hair but it is the volume that adds the best dimensions. If you have a plump face, going too short with your hairstyle will give you the appearance of having a larger face than you do.
Haircut Styles presents Hairstyles For Round Faces – Tips
It is important to add layers to the short cuts and a part on one side or the other to make the face appear longer.
If you prefer long hair, it is best with jagged edges and highlights to give a slimming effect to the face. Long hair is actually the best choice for those with round facial features as it does give the face a long slim appeal. Volume is not recommended with long hair as it is with the short styles as sleekness will frame a round face and give it more definition and softness to the sides. Medium hair bobs, and bangs are a definite no-no and should be avoided at all costs. For round face shapes it either long or short but not anything in-between the two.