hehehe

I just took his light and atmo off and put my big fat atmo.
then i change the surface colours, and tweaked a little bit the canyon to fit my taste (more vertical walls), looked for the pov and add a the sand cloud...
and then i hit render button... not bad hu ?!
Martin was astonished about how the atmo change the surface and how it fits without tweaking around :p
that's a 20 minutes (maximum) work !!!
greenish ?
it might be your screen Frank, because on mine, it sure is a bit too dark but not greenish at all... (and as i am a Samsung colours lover, I love the way my screen renders colours...)