Well, this seem to be a good case for the use of DRM.
But it's users the ones who will hold the keys for the kingdom, not corporations.
DRM only needs to fail once. Then an image is in the wild and can be endlessly replicated (think Streisand effect / network effect).
For a movie, or for the pictures of someone famous?
Yes, lots of people will be trying to break that DRM.
For a random no-one in some small country? Out of millions of random no-ones?
It's a lot better than the current no-protection-at-all scheme.
It can get way out of hand.
It's much more of a Pandora's box than the private "show me yours" that you describe.