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On 'Are you sure you wish to delete this image?' page, show any lists that are using the image so they can be notified if need be
Added on May 13 8:15
If you could replace images with better versions of them instead of having to delete and re-add them, this would often not be a problem, as they would retain the same image ID.

If you want to delete the image for some other reason, like you later discover that what you thought was a real image was a fake or the image comes from a different movie than you thought, there should be a 'Reason for deletion' text box that would send a message to all the list creators who used the image, alerting them of this and forestalling messages like: 'Hey, why'd you go and delete that super-cool image, dude? I'm going to go find it somewhere else and add it back myself.'