Thanks for your kind comments.
Well, yes, illumination is only daylight.
Render time was stupidly high, just because I wanted to uselessly push all the settings in the roof
64000 samples, pmc 32 maxdeph, 5600x5600, etc. = 110 hours of render.
But more realistically, I usually get a very good result at 1800x1800 after 2-3 hours. (2xGTX580)
paoloverona wrote:What about the illumination?, seems that there is only one light source, is it right?, render time?