Looks dark and chilling, excactly the right mood for zombies 
Just two things:
- I think the tiles are still too high. Usually there is no height difference between tiles and the surrounding grass.
- The shading on the little box left of the door seems odd. The wall next to it has its shading to the right while the box has it to the left. (But I'm the first one to mention this, so maybe it's just me)

Just two things:
- I think the tiles are still too high. Usually there is no height difference between tiles and the surrounding grass.
- The shading on the little box left of the door seems odd. The wall next to it has its shading to the right while the box has it to the left. (But I'm the first one to mention this, so maybe it's just me)