Don't bash me for this, but this is my opinion, (not that i have any interest in stealing anyone's art, i have my own imagination) but.. when you make something and put it on the internet for the entire world to see, chances are, your idea is going to be 'stolen'. It's kind of hard to stop people from doing this, because if someone has a good idea, someone else going to take it..That's just how the world goes 'round.. If people don't want their art stolen, they shouldn't post it on the internet.. that's just how i feel :/
~Aroxy