Short hairstyles are bold and breezy, as long as they do not present you with a chipmunk effect. A full_length cut with long and flowing locks is able to slim the appearance of the face by effectively hiding the sides, while a short cut is more inclined to leave the face exposed and bare. Some of the short styles can even curl around the cheeks, which will make the face seem even rounder, and therefore you want to make sure to choose a cut that is stylish and chic, and doesn't leave the face looking chubby.
For men, short hairstyles are nothing unusual since the majority of men in this planet sport this style. These hairstyles are popular for many reasons, such as religious principles (most Christian denominations require a man to have short hair so that his head is not covered when he prays) and one's profession (e.g. athlete, military personnel, or businessman).