I think that one of the flowers should be tumbleweed. That way, farms look like farms, and you'll actually be able to find tumbleweed randomly across the surface.
I think the sand looks great. The brick, I feel, should be a little more pale.The colour of the clay should be muted ever so slightly. I think the sandstone should have a few red or orange horizontal stripes across it to make it look a bit more accurate. The limestone could be a bit more grey. Basalt and Dacite are spectacular.The wood log(side) is nice, but should maybe be a bit more... rough and wood-looking. The birch planks are nice (however, you may want to consider making hem a bit worn). The birch log(side) should have those black lines that birch trees have. The conrete bricks, very nice. Although, maybe if they were a bit darker and a little jagged, they'd be more western-esque.The only thing I have to say here is that you should make them look a little dryer. Otherwise, they're fantastic.
I hope you don't mind my criticisms. I tried my best to come off as constructive. I think it's coming along nicely.
By making the bricks more pale, do you mean pinker? More like the second brick texture?
I tried a couple of times last night and I just couldn't get the black spots on the birch to look right.