Welcome to the forum.
This is definitely not my field of expertise, in fact I know nothing at all about it, but I suggest you look for tutorials on RENDERING rather than modeling.
Be patient, I would expect some of the rendering guys will stumble onto this, and may have some specific suggestions for you.
I just went to the tutorials section on this forum and did a search for RENDERING TUTORIALS and a whole bunch of stuff came up,
looks like a great place to start.