Wack a copyright on the bottom of the web page. Then if you can frame up a good looking legal letter asking them to cease and desist using your copyrighted material, that may work.
You can also watermark your images so they have your website written across them faintly enough to not bother anyone but to be noticed, although that is a bit late for the photos they have already downloaded from your site. I know a lot of gadget and car blogs do this when they get exclusive pics, that way if they are shown anywhere else, the viewer knows where they originated from.
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