Apart from old portraits, my favorite subjects to colorize are vintage cars. I used to have a collection of die-cast vintage cars from Matchbox and later of 1/18 models and enjoyed photographing them against dioramas I would build. Well, I think it's cheaper to just get hold of vintage photos of these cars that are already in the Public Domain and colorize them to create a possible reality behind the photos. There are so many color choices to make and I just have decided on this one for the Mitchell Touring car taken at the Golden Gate Park sometime in the early 20s.
