[following the nice discussion about signs of life...]

Actually, the coloring of the water was the major problem. 

I'm not sure if an ocean on Mars would be so blue; at least 
there is no blue sky which could be reflected. 
And then I had to make it much darker than I thought because 
if I leave the water more transparent it no longer looks like 
liquid water at all but like dark dry sediments. Or maybe, this 
perception varies quite a lot between different people. 

And yes, I decided to make the water (absorption) a bit greenish 
because it turned out that I liked it...
But now, I will be telling people it's some anorganic salts ;)
(Thanks Jellby)

BTW, there is now an updated version on my homepage. I removed 
some spurious water in the background by re-adjusting the level. 
Especially have a look at the crater right back!

http://www.cip.physik.uni-muenchen.de/~wwieser/render/img/mars/3craters-ese-2-1200.jpg

Wolfgang

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