Idea:
So instead of having to delete your image and recreate or asking a mod to unfeature your image just because you accidentally posted it in the wrong stream, you should have the option to unfeature it/change what stream you posted it in.
(Similarly to how people asked for the feature to change your image title without having to delete and remake the image or ask a mod to change it for you after it had been featured).
Hopefully this made sense, thanks for reading my essay :)