You right click, then Google search your artwork. I have been finding LOADS of mine posted all over the net. I have asked for help in getting on removed. We'll see where that goes. Most just remove them without a problem. One site in particular is troublesome, All images are posted where Google or Tineye can not find them. They are being used for Facebooks new Timeline banners. So you may want to just do a search and see. Interesting what you find.