Details:
Rendertime: ~20 minutes processing and 1-2 minutes rendering

Processor : Piii 700mhz

Settings: Only sun and skylight.
min space 1m / max space 3m, so there is a potential to optimize, but since it was for a RT enviroment i used that lower processing setup.

finaly i have changed "some" Values in Photoshop to get that "fettige Finger" look ;)