Number one: Be nice. Helpful. I don't know if I'd go with a numbering system... sounds too much like rating. What I think doesn't need much help, someone else might think needs a lot. I think a lot of direction should be given by the person submitting the picture. What are they looking for? Something for their desktop or a piece for Time magazine? Some responsiblity should be on the person posting the image. For instance: if you're totally satisfied with the lighting, and will never change it, then just say you're looking for help on composition, for example. Tell the people why you're posting the image. What are you looking for? That's one reason why it's tough to critique in the galleries.... one doesn't know how close and personal the image is to the artist's intent. Being helpful is something we all want to be, but it helps to know where the artist is coming from.