Pictures inside museums or galleries should be forbidden all together.
It is ridiculously annoying to go to these places and not being able to LOOK at the art because people are too busy in front of it trying to take the perfect selfie. Which is ironic, because they go to a place where you should be appreciating what is being shown but you only look at it through the screen of your phone. Another tragic example of the showing people you did something is more important than actually living or experiencing it. One example that comes to mind is the National Gallery in London. Pictures were prohibited until not so long ago. Now they allow it. You can't see a single Van Gogh because there are queues of tourists waiting to take a picture of it with their iPads. It completely ruins the experience for everyone.
I mean, prohibiting shouldn't be even discussed if we had the least amount of common sense, but we don't, so...