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I am not too sure about the impact of having the image referenced on multiple sites, however, I do know that the number of links to the page with the image on and the anchor text of those links can have a positive impact on iimage seo.

I agree I went too far. I was trying to edit the comment myself after posting it, but the edit link was broken. Sorry for my lack of control there... I think my reaction was because based on this "go google it yourself" style of answer, and since he has a high forum authority, it looked like he was trolling for Mozpoints by answering questions without really answering them. (Think Ehow.com). Again, sorry for the rudeness.