The building looks great as does the KV for the most part but the tracks do look a little to clean for my taste .
I would agree to adding more rubble , also it also appears the rubble allready there has a slight sheen to it , but that may be the pics.
Im not sure about the crewman sitting on the hull , he does not appear to sit right and appears to have been added as an afterthought, in some pics he looks ok in others he does not , just my personal opinion though

In all though a nice dio
Ian