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Steve, As long as no other resources are are linking to your images, you could use the noimageindex directive as such:

https://support.google.com/webmasters/answer/79892?hl=en

I suspect that you're not going to find anything else but you could go straight to google and use the link:www.domain.com  search operator to see what Google shows as back links.  That search won't show you everything but should give you an idea if there's more to the picture than what's showing up in those services.

Daniel,

Yes, they will count.  Take a look at EGOL's answer on this.