Wonderful - especially as a first diorama attempt! Your bricks are "spot on!", and the rubble in the sidewalk area is ample (maybe a little more in the streets?). Uniforms, poses, jeep, and story composition are all excellent... and I really mean that!
One very MINOR suggestion... on the left wall where the brick walls join at a right angle, you have a seam. This could be easily rectified now with a "drain pipe" to not only cover the seam, but to hide the fact the bricks don't dovetail into each other as you would expect in real life. This is a very common thing in premanufactured kits (I don't recognize this one... who manufactures - or is the work your own original?)