I have made some edits on the Arabic language Wikipedia, and have been looking at various articles and topics through the interlanguage links. As mentioned on the list before, the article about Muhammad on the Arabic Wikipedia is illustrated only with calligraphy images. On other topics (e.g. human anatomy), I have found some examples of how they "censor" images
One way is with a "viewing warning" image, which essentially says "Some people may consider this picture to be disturbing. Don't click here unless you are certain you wish to see it." If you click on it, you see the image.
Another way I have seen is use of the show/hide feature, with the image by default hidden. http://ar.wikipedia.org/wiki/%D9%82%D8%A7%D9%84%D8%A8:AnubisClick
I have tried these out over in my sandbox space on English Wikipedia: http://en.wikipedia.org/wiki/User:Aude/Sandbox7
Maybe an approach like one of these would serve as a compromise on the issue of images on the [[Muhammad]] article. I don't have lots of time to involve myself in the issue on-wiki, but want to put these ideas out there and help inform about how the Arabic Wikipedia does things in some situations.
-Aude