Thank you everyone

@ Bob, the resemblance to Colorado may be because the mountains are bare of vegetation, especially no trees. You'll have a lot of trees in the alps in Germany usually. As I wrote, I though this to be a test render really, and inititally I wanted to take care about the mountains in a next step.
@ Oshyan, I agree the moutains came out really nice. This is an out-of-the-box alpine fractal, no frills. I figured from smaller test renders that it's really the resolution that makes the nice features come out. Also, they slowly rise (which contributes to the overall impression)
because a distance shader lets them grow from zero to default default size. The main point I want to make though is that the alpine fractal is really great in making believable mountains. In past times when my PC (and TG2 itself) was too slow to handle alpine fractals, I was relying on eroded heightfields, or world machine or stuff like that. But that's not necessary any longer.
Frank