How 'bout you encouraging the people you like? How 'bout you posting on the forums when you discover something wonderful in the galleries...and let people know why you think it's so terrific. If you see a persistent error in art, why not throw out a tutorial on a better way of doing things. You don't have to get personal. Just say something like: "Hey, I have a cool way of doing lighting...have you tried this?" The problem with criticism is that it often becomes personal....but there are other ways to satisfy the need to prove you know more than someone else, which is actually sharing what it is that you know that they don't. Just a thought.