Impressive result! Very heavy objects indeed, but the output speaks for itself.
Ryan's tip about using "outside the slider" settings is a good one, somewhat for render quality (but hint: don't bother going above the slider max of 0.8 for detail unless you have a really good reason), but more particularly for many other settings in other shaders and nodes. Literally every input accepts values outside the standard range. An interesting example of this is color values above 1, or very the very high light intensity values that are needed for localized lights, luminosity values for surfaces, etc.
Anyway, if this is the stuff you're producing after just a few weeks, I can't wait to see where you go from here!
- Oshyan