Really great job.
Some notes.
It is a bit dark, edge up the bloom a bit.
Make it slightly brighter.
If you prefer to keep it dark, change the sky to match, partly cloudy sky like that it would still be brighter.
Add a little fog, not too much just a wee bit.
Too much grass, tone the grass back so that it makes a path the player needs to follow as a visual clue.
Reduce the grass size a wee bit.
Angle the fences a bit, as well as move them, every thing is perfectly align, it's neat and tidy where it shouldn't be considering the disaster feel to it, would definitely add a bit more chaos.
Considering the growth on the walls, grass and decay, the tent is untouched and looks out of place.
Win7 pro, Intel 2500K @3.7ghz 660GTX 8gig ram 16tb HDD