If someone were to show something you made off without your permission, how would you feel about it? And how would you react? I would contact them about it, and request that they stop showing off my work without my permission.
What would YOU do?
Edit: Due to confusion, I am editing the whole scenario which I posted later in the topic into the first post. Here it is:
You made a painting, and after you scanned it, you put a little tag that had your name on it onto a not so important part of the picture. You then post it on a popular web page for all to see. Then, Eric Bauman thought the picture was funny, so he edited your name out, replaces it with "This image is hosted on Ebaums World", and then hosted it on his website which gets him lots of money.
Again, I ask: What would YOU do?