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I've used one image so far, and, from a design point of view, I thought it would be best to put the info (name of photographer and the information about the CC-licence) in the ALT tag. Eg "Shopping baskets. Image by flickr user agagagaga, licensed under Creative Commons Attribution-NonCommercial 2.0 license."
I'd like to use more, but want to make sure I'm doing it correctly.
So semantically I'd say that you probably shouldn't use it - however in this case it'd probably be ok to put it here as I can really think of a more intuitive spot - Other options I can think of would be using the longdesc and title attributes, adding text to the image itself, or annotating it below using the <blockquote> or <cite> tags...