Okay, firstly i agree with BlinkforFear, i wouldn't really use the Trash/Junk/Pile models, i think they make the map look really sloppy... anyway, i would try and use more different types of doodads, like different types of trees, more statues, maybe fountains?
If you want a really professional opinion, you should ask ~Void~ or M0rbid.
But, the map does look okay at the moment. There is room for Improvement.