Yes. The squinch is about expression and lower-eyelid tension, not about trying to change a person’s natural eye shape. It can work on subjects with epicanthic folds just as it does on others.

The key is to direct the expression, not the ethnicity or anatomy. Ask for a subtle tightening of the lower lids / a slight narrowing of the eyes to project confidence, then evaluate the result on camera. As with any posing direction, sometimes it helps and sometimes it doesn’t, depending on the individual face and the look you want.

What matters is treating it like any other portrait adjustment: you change lighting, camera height, pose, or expression to flatter the subject. That’s normal portrait direction, not inherently offensive. Keep your language focused on the portrait goal—confidence, intensity, relaxation—rather than on her ethnic features.