Ghostrigger's wording is nice, "Poor Artistic Selection" is clear and concise. We could try working the poor art option as "Poor artistic choice" as well, keep it short and simple, and use, "Poor Digital Quality" for situations with more serious flaws along the lines of image degradation and digital noise issues.
On the contributor +/- thing, if having an upload be flagged plus marked poor quality occur, a note should be entered in Mod Actions or Feedback that the system itself has kicked in and forced the contributor on the queue, and labeled them in need of review. It doesn't have to be a negative, just a neutral feedback note the system makes. Maybe after an arbitrary set of times this has happened in a short time can give evidence to the moderators to enforce a probation, rather than an auto-probation that kicks off, so for that we need to note the exceptions:
Having the statute of limitations will prevent older images from unfairly affecting otherwise good contributors. This should also include an exception for artist cease n' desists, corruptions due to failed uploads when the system decides to screw things up, and immunity for when other users cause harassment (such as during some users mistagging images with banned artist tags).
So from that, lets say, Contributor X gets 4 failures due to poor quality in a set time of a month, then the matter is alerted to the staff, and a probation option is given, but only after a user review has occurred. Maybe putting user reviews into part of the moderation queue could be useful to this, no?
At the top we can have problem users appear in a list and their incidents show up, like they do in the dashboard, and the moderators can vote whether that contributor should be sent into probation, with a comment list of all admins/moderators/janitors marking for or against with a chance to explain their reasoning. Or we can spin that off to its own "Contributor Review" page and keep it out of the queue.