Piatkow said: "If the pictures are hotlinked then rename the files."
Sure that fixes the hotlink, but wont fix the Google Image thing.
If picture.jpg is renamed to image.jpg, then Google Image Search will try to look for picture.jpg... What? Is it gone? Take it down
If picture.jpg had at least a couple of hits (or dozens+), those visits will go, poof, gone.
This issue has also appeared when you ask your webhosting provider to put a "no-hotlink" rule on your hosting account. That way, no one outside your site (or sites you give them permission) will leach.... in those cases, same result... people have reported being kicked out of results.
Also, about getting a lawyer and stuff, too complicated and costly.
1. Email the webmaster who steals your images.
(sometimes they are fans or people who just liked your image... if that is the case, ask to make a credit and put a link back to your site, of course, the link must have a keyword (topic of your site), so it is an useful link).
2. If the first email doesnt work, make a "DMCA" complain to the webhosting company. (Not a real complain, but you mention you will make a formal DMCA complain).
This is the easiest way to go. Webhosting companies just run in panic when they see that. The company will email thief and ask to desist. Sometimes, they will close account (but they can switch from company)....