There are so many choices for you.But it mainly depends on your face shape.If you have a wider face, you should get giant semi-round but not completely round. If you have a skinny small face, then the small rectangle glasses will suit you best. If you can't decide which shape you are belong to, just take a friend with you to try them on at the optical store, your friends will give your honest opinion. The most important is that you choose the one you like best.
First, you should determine what kind of shape your face is. A good sunglasses would fit the actual shape of your face. If you have a small face, a smaller frame sunglasses would go well with your face. If you have a large face, then you need a large pair of sunglasses, like oversized sunglasses which may look better on your face. Be sure to choose sunglasses that you like best, which will make you to be confident.