Rasputin - 6:02 pm on Sep 5, 2011 (gmt 0)
I never look at my image results much but just have, prompted by your question.
The three first examples I looked at were showing my images on other sites (ie stolen) on page 1, but not my own images. So I think you're right that they aren't attributing them correctly.
Another possibility is that sites hit by panda are losing both page AND image rankings - my originals of the three images above are on my main site which was hit by panda, but further testing suggests that images on my 'non-panda' sites are still showing correctly in the results.