Today I concentrated most on the light of my level. But my first “quest” was to add the cliff model into the scene and apply a material to it.
Now I added a skysphere to the level. It´s the default skysphere of the UDK but a bug modified the skysphere so that it looks different. Then I added a DominantLight to the level and set LightShafts on. Now the light looks much more better.
Finally I added a HeightFog to the level to look more atmospheric.