Looks good. i attached a few pictures with Feedback. Hope this helps. :-)
You should extend the mid area.
Red: Change the texture to the ground/dirt texture.
And you should use the ice texture, instead of the glas texture.
Green: Change the texture to gras.
Red: Extend the brush.
Green: Change the texture to gras, again.
Red: Extend the brush, again.
Delete this. This is needless
This area looks really empty, add a barrel or something.
Add sth like a ramp here.
Green: Change the textures to gras.
Red: Extend the brush.
Add a wall-brush here.
The windows should be deeper.