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Aside: I don't allow outside linking to the pictures on my site so when one clicks on the picture in Yahoo images you get an error that says "The image you are trying to view is either temporarily unavailable or may no longer exist." and then gives a menu listing of the entire directory. This is almost more annoying then having people leech the pictures and bandwidth.
There you go, from Yahoo's Help pages for their Image Search [help.yahoo.com]:
How do I remove my copyrighted image from the results? [help.yahoo.com]
Just in case, I include these two related entries in my robots.txt --
User-agent: Yahoo-MMCrawler
User-agent: Yahoo-MMCrawler/3.x
Disallow: /
And to belt-and-suspenders your safeguards, you can also include:
User-agent: *
Disallow: /your-image-directory
Good luck!