OT: here my Result after watching this Video:
Left: Around 1000 Polys
Right: Around 18000 Polys



Very great Tutorial!

Sry for OT...

cYa Sebastian

Tutorials:
[Blender]Terrain creation ENG/GER
[Blender]Low Poly Tree Modeling
[GIMP]Create a Texture for Terrains
CLICK HERE