Here is GC’s self-portrait of 1918, now at the Fitzwilliam Museum in Cambridge. If you look at the last oil painting I’ve shown, In the Orchard, it’s hard to believe that this is by the same artist. To a non-GC-trained eye, it may look dull. His portraits could be conventional (one or two of the late portraits look like boardroom paintings), but this looks fresh and modern to me. It is almost the portrait of a scientist.
Comparing it with the earlier picture, we can see what a long journey he was on. Comparing it with contemporaneous landscapes, we can see what he is taking from them.
I categorise it on the right as GC late, and I take that boundary as, roughly, 1918. This is an early example of that dry paint he used for his pictures of the 20s, with the canvas showing through.