From The Mana World
Use categories?
I think this page would be more useful as Category:WIP_Art, and then each individual work could have other category tags. There could also be per-artist tags.
For priorities, I would recommend only 3 or 4, High, Medium, and Zero (I think this name will tend to move people toward the other categories). Remember that (the top section of) each Category page can also be edited, and categories can contain other categories.