Cat-eye corners or a lower top line?
A cat-eye raises the outer corners. A rectangular or low pillow-shaped rim runs more horizontally across the face. If you usually wear an upswept frame, compare it with the black Vogue VO5666S shown below. Its rounded rectangular outline has a broad rim, rather than a cat-eye point.
Compare a broad rim with fine metal
A thick dark rim is easy to see against the skin. The gold Vogue VO4352S uses a fine rectangular metal outline and separate nose pads, so the border is less prominent. Try the two with your usual hairstyle and earrings. Keep the camera angle the same if you take comparison photos.
Clear, gradient or folded
The crystal Gregory Peck frame has blue photochromic lenses. Erika 622/8G pairs a matte black frame with grey gradient lenses. Those are different lens choices, not just different frame colors. The Persol 714 is pictured folded, so use its model and size details rather than judging its worn width from that photograph.
Let oversized describe the look, not the fit
A taller lens and a heavier rim can look oversized without telling you how the bridge will sit. Compare the arm numbers with a comfortable pair, then check the bridge on your nose and the temples at the sides of your head. A round face does not require an angular frame, and a square outline does not require a curved one.
