Nice scene John. Personally Id have the gas tubes closer to the building and maybe a bit more weathering on them, as they look quite new. Considering they are thrown outside an intact building, they muct be unwanted/old/used/etc.
The hands on the crouching figure ... are they painted to be gloves or have you forgotten them (see second last image)?
You made a great job on the snow at ground level ... very realistic ... but then theres no snow on the rubble in front of the stug.
Sorry for nit-picking ... this is a great dio with both composition and amount of nice detail on display, and little touches like these, can make a big difference.