@zionner: the node network for this scene is a real mess
.. However here's a cap
The node named 'ghiaccioli' is a fake stones shader that represents ice. The node on the left named 'default shader' is the ice shader I've posted here. It's linked over the 'ghiaccioli' surface node passing by a redirect shader with Y axis stretched by a power fractal
@bigben: I've saved both .bmp and .exr version of my renders, but I got the final images from the .bmp format. The last image it's not downsampled and was rendered with very high antialias value. I've set it to 9 and worked good (and almost doubled rendertimes!). The scene is also splitted in two parts - I rendered the upper trees in a separate scene because I was unable to load all the .tgo models and textures due to lack of RAM. I used Photoshop to rejoin the images using alpha channel, and for some color correction and contrast enhancement
Thanks again for all the comments! Maybe I'll post some other update
Regards, Lucio
