Why do we need 3 different tags for this? Is there any difference?
I understand that the terms might be a little bit different by definition, but I don't think it matters when tagging questions on SuperUser. Also, there's already photography.
I think just a tag clean up of Images, and merge Photos and Pictures. Or, option 2, is to make [system-image], [cd-image], [disk-image] all for [image] (not my first choice)