Hey guys! Ikemarth here!
I know some of us have had our fair share of stolen artwork. But I did come across this site that allows you to track down if your work is used anywhere on the internet. All you do is add the image file or link, and it will show you if it has been used else where.
This site is called TinEye
I'm still figuring out how it properly works ahah 
I hope it helps.
