Recently I had a conversation with a fawiki friend and asked if fawiki have any problem about hosting those images on their article. First he seemed to be very surprised to know fawiki hosted "Muhammad's images". After giving a glance, he got his calmness again and said they were not "depicting Muhammad" and Muslims know that. There are rather products of imagination by each artists. So they are okay. And interestingly I haven't heard anyone complaints about fawiki hostings.
What other kinds of images of Muhammad are there? There are no contemporary portraits, so they're all products of imaginations of artists...