Not a new piece of art, but a new signature on an existing piece.
A few years ago, my daughter became a Dr. Who fan. It turned out that same year that Comicpalooza had four Drs. Who as guests. So, I did the obvious. I commissioned Thom Zahler of Love and Capes fame to do a piece with all of the Drs. Who on it and I got it signed by those four Drs.
Since then she's added several of the companions and, just this year, she's added three more Doctors: Peter Capaldi at Fan Expo Dallas, Matt Smith at WW Austin, and David Tennant at Alamo City Comic Con.
Fair warning, Tom Baker (4), John Hurt (War Doctor), and Christopher Eccleston (9), we are on your trail!