Someone Using My Photo For Their Own Purposes

When I was searching something at ebay.com.my and to my surprised was that someone out there is using my photo without my consent and displayed it at ebay becuase I think this guy does not own a camera and take other people's photo and sell at ebay. I think this guy does not have manners and at least ask for it instead of downloading my properties. This guy with so many ratings to himself also do this kind of thing.