I think ShadowWind has some very good points (and is probably now cursed because I agree). Personally the idea of a WIP/Crique Forum would be worth an experiment. If it gets to be a troll hole, the plug could be pulled, but if it is used as a workshop to improve people's artistic as well as their technical skills, it could be very exciting. And maybe some tutorials would come out of it. You never know unless you try.