As I said above, but here again, and in better detail, from the following website: http://ponderosaplantation.com/american-dominiques/
Below we have the Dominique Standard Illustrations. These photos are the final product of A.O. Schilling’s interpretation of photos of winning Dominiques from 1913. These drawings are listed in the American Poultry Association’s “Standard of Perfection”.
It's weird that they call the pictures both photos and drawings. Like you say - probably touch-up of actual photos.