Don't steal and profit from my work!

Interesting thing happen tonight. Was looking at some pictures on Google and came across a zombie design I did awhile back. Thing was it was a print of my work laying flat on a table. Click on the image and followed the link to a trader sight with a guy selling the picture and as a iphone cover!! $65 dollars for a sign and $40 for the cover. Wonder what my cut will be? Ha He said he is selling them on Ebay as well. Funny thing is he didn't even bother to hide the fact it is watermarked and signed by me.