Kahn's work, usually of structures embedded in landscapes with an almost "pastel" color scheme. As you can see that sounds like a horrible thing to say but Kahn's dreamy color schemes, his subdued coloration always seems to work. Pastel isn't QUITE the way to put it but close enough. Some of his pieces are simpler (to the point of abstraction) and others, like House in the Maine Pinewoods, have a more realistic look.
Diaz has numerous pieces using this same image and this is one of the more colorful versions (it is mixed media on wood panel). There is always relief and texture in these works that do not come through in photographs. You can see a bit of this but, really, you need to see them in person.