It costs us far less to look at a stranger's body than at our own in four-in-the-afternoon light. And it is not vanity: it is a surveillance we were taught early, and it keeps running on its own without anyone switching it on.
You owe no one a real-body photo to deserve being touched with care. Permission is not earned by getting thinner or waiting for a better summer. It is practised, sometimes clothed, sometimes not, always with the option of saying not today.