Nice overall diorama. I like the multiple mini-stories involved. You don't see turely burnt buildings depicted. The burn technique is nice. I like the creativity you've displayed with the figures, as far as repositioning them from thier intended use. Nice detail all around.
I'd like to offer some suggestions for your next diorama. The one thing that struck me and took me a minute to figure out what was fooling my eyes was that the rubble is 'red' and the broken edge of the buildings is gray. If you could either represent the redness in the edge of the breaks or break away some of the outter plaster and represent redness there it would blend the rubble to the building a bit better.
On the side away from the motorcycle I would personally like to see more rubble. There used to be a two story building there, where's all the 'stuff'.
This is something
every modeler of dioramas fights with. We All have Tamiya's sandbag set and we all try to find a use for those bags.

They are soo stiff looking. If you could make a couple out of putty it would 'ease' the look around the barrel.