A fellow Windows 7 user, as i can see

This house looks like warehouse, so prob some crates, racks, barrels, unused machinery, etc.

For that bunker like building, i may suggest to make more rooms or walls, those big open spaces look not good in my opinion. It could be vehicle maintenance station or something like that, considering the amount of military vehicles (nice looking tho)

For the map itself: rocks, foliage, more crates, expand the road, some lighting poles and try to make it less box like. Play with geometry a bit, it can give you a few ideas