My friend asked me tonight if i could find who made the picture he found. I searched and found this. Maybe it is useful for you too.
http://tineye.com/
Edit: http://searchenginewatch.com/3608126
Cheers.
Kadri.
used that a while ago and despite the fact that the database of this engine is still small, I immediately had some hits. It´s a useful project I think
You may also be interested in this Google project: http://similar-images.googlelabs.com/
It does not work like TinEye, but it is also interesting.
Thanks. :)
Kadri.