The paints are all from M Graham. The most used were cobalt green, azo yellow, and tartan blue (an old limited edition cerulean). Cobalt violet was also used with the yellow to produce the browns, and a small amount of cobalt teal for the sky. So two blues and one each of green, yellow, and violet.
I tried to use stronger colors than the original by Francis Towne, which looks dull and washed out to me, but I started too strong at the top and didn’t end up with the full range needed for atmospheric perspective. So the original actually has a stronger sense of depth. Also the cobalts, which naturally granulate, gave this copy a lot more texture than the original.