as I said in the other thread: great render!
I'm curious if you could get something going in this render that I liked particularly well in the MentalRay image: the really bright spots where the sun hits the bark (plus the rays, of course). Maybe through specular highlights through a reflective shader or the texture's default shader?
that's usually the difficult bit with tg2 (at least for me): dynamic lighting, without making the overall image too bright, or some places pitch black.
40 hours are a lot of course, but I would really like to know if you can give the image the same or similar lighting dynamics.
It could well be that it's easier to achieve in post, though.
Cheers,
Frank