It is advisable for people to choose sunglasses contrary to their face shape. If you have round face , you should avoid small and round shapes and very large frames which will make your face look less rounder.Choose styles that are wider than they are deep, and square or upswept shapes that draw attention to your upper face.
Round faces are usually featured with round line face. To flatter them, sunglasses with angular frames are good choices that cover or reduce their defects. So, from this point, you can try square sunglasses, rectangular sunglasses, cat eye sunglasses, wayfarer style sunglasses etc. To give you the best look, you'd better try on them and choose the best suitable style.
To the round faces with a fair complexion, you'd better wear some square sunglasses in dark color if you are a male because it will create a great contrast in your appearance that draws others' attention. While if you are a woman, you may as well go with your style to keep harmony with your look, which means a pair of small light round sunglasses is really something to you.