Are we really going to have the absurd argument about prototypes being in the public domain again? I don't know anything about Kitty's Catch, so I can't speak to that, but anyone selling repros is engaged in a violation of copyright unless they have permission from the rights holders. Famous artwork that is not in the public domain (i.e. the only public domain artwork is generally from prior to 1923 for US artists and older for French artists and certain other countries except in those rare instances where an artist has released the work into the public domain) cannot be replicated or copied without being licensed. In fact, you can't use it in any commercial way without permission unless you want to get sued. There are some exceptions under fair use, but duplicating a piece of art for sale is not even close to fair use.
One of my first jobs in television was handling litigation on behalf of television producers who were being sued by artists and other rights holders for using their work allegedly without permission. It gets expensive to settle those claims and you would be surprised at how many shady print companies there are out there selling poster prints of artwork they have no right to sell or rent as television set decoration.






