I wouldn't make something as open as TalkImg, since otherwise after a few years I'd be getting like 100 DMCA takedowns per day which I'd have to figure out some way of processing. It'd have to be somehow a lot more restricted so that the long-term moderation burden isn't too high. I'd rather avoid having to do it at all.
I guess it wouldn't be so bad if you only allowed ranked Members to upload images + add some limits similar to what we have with DMs. It would be more convenient, for sure.