You're precisely incorrect as far as the law is concerned. If I make a painting, I own the copyright. If you take a picture of said painting, you own the copyr

You're precisely incorrect as far as the law is concerned. If I make a painting, I own the copyright. If you take a picture of said painting, you own the copyright on the picture. If someone makes a collage of your picture they own the copyright on the collage. Both of you are liable for copyright infringement against my rights, but this is independent of your own rights as described above. This is not a legal advice, talk to a lawyer.