Did I mention he's paranoid too?
I see that the image URL encodes my own unique session ID, presumably so he can track who's "stealing" his work. Your session ID wouldn't match, so no image for you, buster.
All of which provides a disturbing window into the way Uncle Gadget's mind works.
I'd better edit my mark o'the beast out of that URL before Uncle Gadget starts beaming those HAARP waves at me. Or venture timidly out after dark to buy more aluminum foil.