... yeah, I am afraid of you guys!
If you say that photos looks "promising"... !
Anyway, i have tried in these days to emulate the light condition of the two photos. These are the results.
Still not 100% happy but...
BTW, I am having problems with the henyey-greenstein coefficients.
In these two renderers I put it to 0 for RGB, while using the values tabulated by Jensen i get a dirty gray substance! Also, keeping the value but reversing the sign (I thought that maybe the sign convention was different) I get a bluish stuff. Any ideas?