Thanks a lot guys!! That was really a hard work but the result and the things I've learned was worth doing! And I also don't wont to hold it like a secret so I will create a little how-to and showing my work-flow for this scene (If you are interested) even if some of you might know how to create things like that. Be patient might take some time (maybe Ill do it on weekend)... Don't know, maybe someone can tell me if the wiki is the right place for something like that?!
In the end I really got short in time with rendering. Ive started in the end of the 30. with rendering which should be the final, after I'm coming from work next day I was really shocked when I saw that I selected the wrong materials...
fortunately the clock here in germany goes 7 hours ahead, than the forum's one.
@tokiop: Sorry but I don't have renders with more contrast etc. But I think I could create them in view of a how-to/work-flow