While it might seem petty, knowing the shape of your face is important for a number reasons. One great example would be for haircuts and hairstyles. The shape of your face affects the way they look. They are the reason bangs look great on your best friend, but maybe not so hot on you. Another huge factor is makeup (think contouring). The shape of your face determines what features you choose to emphasize, and which ones to leave alone. So, is your face round, square, long, or heart-shaped? Follow these four steps to find out!