The 2 first pictures looks pretty good overall, but on the 1st you could maybe add some water doodads to make the coast or whatever you call it look a little less empty.
The 2nd picture has a very small orc tent that I find weird since it's alot smaller than the grass itself.
The 3rd I'm not really sure what I'm looking at? Alot of grass, fences and a Peon in the middle with a house behind him.
The 4th looks awful. The gate to the left is cut in half, in front of it all is just a pallisade with a grunt, and on the right side of the picture I can see the edge of the map which doesn't really reek of good atmosphere.