Fayte this isn't the mapping improvement thread, so I won't get into every bit. Your grass seems to blocky, you have an error of tiles near the bottom-left of the screen. You seem to have logs far away from cut down trees(Just seems weird to me), on the top-left you have a shadow error. And the camp fire looks oddly placed, but thats just me. Heres a nice fog for a dark calm sort of forest, don't know if it suits your setting though!
http://img134.imageshack.us/img134/1888/20447453nn9.png[/img]
http://img134.imageshack.us/img134/1888/20447453nn9.png[/img]