Venom.... Good work... no need to repeat the kudos mentioned before me, so I will only offer a few minor suggestions:
1) when working with "brick" exterior, a neat way to show of the brick and give a realistic "mortar" look to the standing brick walls is to smear a coat of damp spackle across the surface. Let it sit for a minute, and then use a slightly damp rag to wipe off the surface area. You will then have a nice neat white mortar between all the bricks. Very realistic! (see image below this post for an example)
2) it might be just me, but I would suggest a good dose of dark umber wash be applied to the exterior surfaces as well... the yellow cornerstone work looks a little too clean to be part of a house that has been so thoroughly demolished.
3) You have good rubble... most people don't use nearly enough! More is almost always better, especially if you look at pictures of urban warfare zones... The only comment there would be to add some shattered wood, and perhaps add a bit of the afore mentioned spackle to some of the bricks to indicate mortar that is still attached to the scattered bricks.
