the same way we regulate it for child actors, move stars

and other people whose income we need to control.

In other words, you don't regulate it. People earn what they deserve; most people will end up with nothing for their image and likeness because it won't be worth anything.

Do you know what Marvin Miller's greatest fear was when he was negotiating for free agency (among other things) for the major league baseball players in the 1970's? His biggest fear was that the owners would just make every single MLB player a free agent after every year. And why is that? Because he knew that if every player was a free agent annually, only the very top players would get paid a lot and the bottom 2/3 of the players would be fighting for table scraps.

So by allowing the owners to "regulate" when players hit free agency, binding arbitration, etc. he was able to help drive up the salaries for all players.

Enhanced regulation is not the answer to any sort of problem you can come up with here, Pat.