THEY DON’T SMILE—THEY SQUINCH
Toothy smiles tend to look slightly maniacal and forced. That’s why photogenic ladies employ a technique called squinching. Basically, you tighten your eyes slightly like you’re squinting while subtly relaxing your top lids and letting the lower ones do more of the work (where the “pinching,” of sorts, comes into play). Here’s a video how-to if you’re a more of a visual learner.