Yeah, I agree re: the steps... You've got this awesome organic form going on with the house, then obvious brushes as steps. Definitely thinner steps would help, and pulling a few verts could help break things up a bit - might even consider splitting a couple of them for a nice cracked and worn feel.
Might also spend a little more time on the roof - from the second shot, it looks really cool, but up close it looks a little weird around where the left side of the building sticks out.
Really cool vibe overall, though. I like! What's the goal of the battle? DM? SP? general scene-building?