An idle search in Google images for “Mithra Zoroastrianism” brought up precisely NO images of the Zoroastrian god. It’s quite interesting, really, not least because I have no idea how he was depicted — if he was depicted — in reliefs.
It also brought up a number of unfamiliar tauroctonies of Mithras. The need for a large collection of images of Mithraic sculptures etc was never more apparent to me than today. We can clearly learn a great deal, simply by comparison, without undue theorising. I was almost tempted to start locating images and getting my camera out!
Mind you, an online list of places to visit and photograph would itself be a useful thing. We don’t even have that! If we could put such a thing online, one might get enthusiasts to contribute by visiting museums. It’s a wiki-project if ever there was one.
How I curse the wretched troll, who cold-bloodly plotted to wreck the Wikipedia Mithras article, and drive off all the honest contributors, for destroying the best means of collaborative work in this area!
I wonder how else it might be done. How does one contact Mithras enthusiasts? A few people doing day-trips to museums might contribute much!