You can add the Copyright symbol. And write a notice below your work saying that if a person has to copy or copy-and-change you work, they should contact you or something. Make sure you leave you email [If you wanna.] And if you see your work anywhere else, just report the person or talk it out with them.
Gauguin infused his masterpiece "where do we come from? what are we?
where are we going?" with all of the given themes above except art for
art's sake.
