We see a lot of people in selfies wearing sunglasses, and... whatever. I am a strong believer in "the eyes are the window to your soul", and when you cover your eyes you're essentially presenting yourself as a blank faceless person. But it's a selfie, so... whatever, it's their gig.
I also see it occasionally, albeit not nearly as often, people doing the same in formal portraits that they're paying for.
Short of a legit medical condition... which happens but is not all that common, let's be honest... how can I tactfully encourage people to not wear their sunglasses during a portrait shoot?

