Your bricks are too perfectly broken. What are the chances that all the bricks would cleanly break along the ..uh.. mortar lines (?... sorry for the terminology... not a mason)... like that? They should be ragged, imo. Also, everything is pretty clean, at the moment. The snow is pristine, white, the bricks are clean, the frames (despite being broken) look to be in perfect condition, etc. Throw in some debris, crack up those walls more... things like that.
A bit of reference for a shelled building. Note the ragged way in which the bricks have broken away, the sheer amount of debris...As for the shelling crater, it should, for starters, not still be white. chances are that a shells would blow straight throuigh to the street, unless you have, like, 20 feet of snow there, and even then, it would burrow through the snow and blow it all away/melt it when it exploded.