I might suggest: "Needs Touch-ups" instead of "Needs Work" and "Needs Work" instead of "Needs Much Work." I'd drop the "Needs Overhaul" personally. If the picture needs more than touch-ups, then it needs a good amount of re-working. There's no need to rub the artist's face in it. I think that even if meant well, "Needs Overhaul" could start a small flame war without very careful comments in the critique area. The one issue I see with these rankings is that it is more difficult for people who do not speak English to participate. Maybe a pop-up with translations for non-English speakers would help?