IMHO I think there are only a few photographers posting their image without any postwork. Most of us, me too, do some touch ups on their photographs... like colour correction or contrast/saturation and so on. This should still be allowed as well as cloning out some unwanted areas. As long as a photo still resembles a photo it would work for the gallery. Also I think collages would go well with the gallery. And some additions like "bubbles" wink @Cyn should still be allowed as well as mixing own photos together. But an absolute NO on using 2D elements. As long as those 2D elements are only added to a frame it would be ok. Stock photos or changing a photograph with a 3D creation is a clear NO, too. Now I'm curious on the opinions of all the other photographers here :o)... this should gonna be a hard discussion.