Dan, looks really great! Nice work on modeling and materials.
Seems like if you lowered the gamma just a little (at least on this computer screen I'm using) it would look instantly better... slightly darkening the dark areas to give a little pop.
I took it into post pro with just a mild color pop, detail pop, and shadow deepening I think it's great!
You could use a warming filter on it, or use warmer lighting colors... as this set up seems just cold, almost fluorescent lighting like.