Round faces best suit straight, angular shapes to create more structure in the face, as well as styles with a slight upsweep to highlight the cheeks.

Square faces should wear a rounded frame to soften the lines of the face. A frame that is wider than the face helps to balance the proportions, and a defined brow will draw the eye away from the jawline.

Heart shapes faces suit oval and round shapes which bring balance to the face and make the point of the chin less severe.

Oblong/Long Face shapes suit round or square shapes with more depth than width. To help break up the long lines you can look for decorative or geometric frames.

Oval face shapes are lucky in that they able to wear most frames. It's best to avoid very round frames, but other than that upsweeping cats eyes are a nice way to highlight the cheekbones.