Here is a site I have found that uses artwork illegally, when I approached them about the use of this piece I was commissioned by Paizo to do, they were dismissive and unrepentant about their actions. I would recommend to have a look through their site and see if they are using any of your work illegally.shopblujay76.com/t/creatures
It appears I may have been too strong in the use of the words, steals here, but I will stand by the statement that the above site uses artwork with out proper copyright permission, and whether it is to sell the work or use it for advertising this is an infringement of copyright law.
I will not retract my statements about the products the art work is being used to sell, but i will say they are my my person opinion and not the thoughts or opinions of any one else, especially Paizo publishing. I am in no way speaking for anyone else when I say I don't like my imagery associated with I believe to be a fake product.