I had suggested the implementation of a "versioning" system for the images. Here is how I have thought it:

1. When you upload a new image, you are asked if it is a "new" image or a new version of an existing one.
2. If it is a new version of an old image, a drop-down box lists your "x" last uploaded pictures so you can choose one of them.  (only the last "x" ones because otherwise the list could be filled with hundreds of images).
3. When you look at a versioned image, a line on the page could inform you that there are previous or subsequent versions of the same work, and offer the direct links to them.
4. Each image could have separate comments like they have now. Combining this feature with the possibility of making multiple posts per for each image (eventually with only one rating), we could have a coherent "discussion thread" for each posted work.

Giorgio

giorgio_2004 here, ksabers on XBox Live, PSN  and everywhere else.