If you have the small faces, I strongly suggest you to wear the Channel sunglasses which are so perfect at the design and the quality. It is so fashionable at the whole design. At the same time, the quality of the real ones could be so perfect. You could have a try. You could go to the real store to have a look.
It seems that almost very kind of sunglasses flatter small faces. I think you can try two kinds of sunglasses, the first one is small round frame sunglasses. With its round, small and sleek design, it will successful attract people's eyeballs. As your face is small, the small frames will match with your face shape, and makes you more beautiful and attractive. The second kind is medium size frame sunglasses, such as aviator style sunglasses and cat eye style sunglasses with different colours and so on, they are very classic and fashionable. The medium size will make your small face look more pretty and charming. In all, before choosing the best sunglasses for your small faces, remember never choose big wide frame sunglasses for your small face, on the contrary, it will make your face smaller and weird. You should try the right size sunglasses that proportional to your face size. Therefore, don't try to compliment your small face with big sunglasses, otherwise it will be difficult to wear and makes your tiny faces look ridiculous.