I don't like the layout of the level. the thing looks great, but it's basically a flat plane with mountains around it. there's just two levels of height, plus one thin river...
http://www.bildarchiv-boden.de/kula/kg/Bach-Neuffen-Fruehjahr-klaresWasser.jpgI think you should add a dirt texture in some places. the green's too consistent.
there should be a slower transition (at least in some places) between (way too) rocky mountains and grass plane...
it looks amazing though!
Micha