A few things bother me :
- since the trees are overlapping the houses, I guess it's because they're tall ones : In this case I'd add them some drop shadows the same way you did on houses.
- some lines are too pixellated (lines on houses roofs, wood fence, pontoon
- you still have a layer border which probably needs to be erased (just below the first letter "T" on the title)
- Some shadows on houses roof don't fit the others.