Painting enlargement, revisioning

I am enlarging one of my small Kensington oil sketches to a 24" by 24" (61 cm x 61 cm) format, using a photo as a reference as well as the small study. I may have to break down and buy some paint for the first time in a year!

In this process it is astonishing how little of value is added by the photo, in which so much color is missing.