There was a WG on Adultwork a short while back whose profile stated that she would only see you if you sent a picture, "as she had posted her own picture". Which is a complete non-
sequitur: she's the one doing the selling! Anyway, the picture she referred to was a sort of "holiday snap" portrait of a middle-aged woman, and gave no idea of her figure, as well as having zero erotic content. She lasted a couple of months before disappearing permanently. I came to the conclusion it was a prank profile put on AW during the summer holidays by schoolkids, using a random family photo. Not surprisingly, by the time she vanished, she had accumulated zero feedback.
That apart, I reckon any escort who claims to only see punters who provide pictures of themselves is either delusional or up to no good.