Having lived in London for about 10 years, I'm still wondering who did the most damage, the Taliban on the 7th of July '05 or these retards damaging their own country...
I think the floor is too uniform. Its just a relatively flat plane wth rocks and rubble. Maybe add ramps or building set on slightly higher elevations?
I think you could use sth from this tutorial by Lennyagony, look for the low poly part and the parts below that. http://steamcommunity.com/sharedfiles/filedetails/?id=123397498
This is one of my favourite work. My suggestion is to desaturate the color palette. The details are amazing but for the main color come back to the early version that you published on march 26th.