I have two pictures of Billy the Kid, aka Billy Bonney, aka Henry McCarty, aka William Henry McCarty. They were taken about three years apart and show that his appearance changed during the intervening years, which had been hard ones. The younger of the two Billy's was probably taken in March 1878 at the Chisum ranch. The photographer's name is written along the bottom of the image. It is George W. Morgan. I found many other pictures with his name afixed, but most do not. I suspect he ran out of embossed frames. I eventually drove to his hometown and found hundreds more of his pictures stored in the Historical Society there. Several of them were of Lincoln County War people and several of them are of well know people who Sallie Chisum also collected pictures of. Pretty compelling evidence.
Here's the Kid:
