You know vintage and exaggeration is the fashion of sunglasses just now. However, the small face will have some limit in the choosing of sunglasses. The exaggeration and full decoration will not suitable for you. The one you need is an exquisite and classical vintage sunglasses
with some tiny ornaments. Otherwise, your face will seem smaller than it's real. Simple but elegance style is the best choose for you, no matter what brand or color. Ok, go ahead to pick for yourself, you can try some colorful ones to light your image. I can give you a small suggestion, if your skin color is light or blonde, the red tones will let you in pink face with good complexion. Hope the suggestion will help you!