I think the creators expectations of "what's useful critique" and the critics expectations of "what help does the artist want" are at odds in general. If that makes sense.

If you go through the galleries looking for something to comment on, you could find faults in a Rembrandt painting - just based on your own values... seems to me.

I think more artists need to state in their image description what kind of help/critique they're looking for or most likely they'll get a lot of feedback that does them no good... or worse, leads them in a wrong direction (what the critic would do if it were their image... with their goals, etc).

This is a good concept overall though