i often find myself using the same custom images in a lot of my maps, so i think a favorites list would be a good addition.
something else that would be helpful is if moderators could list a reason for a custom image's rejection in the cases that are less obvious, since it's kinda annoying when i upload an image that gets approved initially, but is then rejected later when i already have it used in maps, i'd like to at least see some sort of justification for those scenarios.