All right, it appears that you have got a cute figure and facial structure. Anyway, from what I know, it would be unwise for you to try some sports sunglasses, which would not be compatible with your face and vibe. On the contrary, I would like to recommend cat eye sunglasses or something feminine that would add attractions to you.
For the thin face people, the exaggerative frame of sunglasses may not be suitable for him. But the fashion decorations would be applied on your sunglasses. You would choose the light color especially the white color, because it would make people feel your face is not as thin as it is. You can choose the exquisite and elegant style sunglasses to match your own feature. The similar style with the sunglasses and your face will make the harmonious feeling happen, that will increase the joy for you and the people around you. If the condition is allowed, the classic mega brand sunglasses will help to make up a wonderful and cool face to your satisfaction.
For people with thin face usually have narrow cheekbone. To compliment them, they shall avoid sunglasses with big wide lenses and frames. Personally, if you want to a retro fashion, you can small round sunglasses. If you want look sexy, you can try cat eye style sunglasses. Besides, some sunglasses with round frame line are recommend. Also, you can try aviator style sunglasses for a cool look.