Hey Mahnmut.
Another classy versions!
It isn't exactly Mars i wanted to (re-)create. I just have to create myself an snowy, icy planet/moon in the near future for a sci-fi short project of mine, WIP titled "Welcome Home".
Planned was a cold planet (where some action takes place) which is orbiting maybe a huge gas giant in a solar system with 2 suns, with shots farer away and also closer ones.
The look and visual quality of your planets, especially of your final "White Mars" were matching my idea/vision of a snow planet and wanted look/visual quality i'm aiming at very well.

Me too was thinking about "raping" licence free HQ ESA/NASA HQ data's of known celestials. Thought about reworking and mixing maps and pics for creating a new extraterrestrial surface/texture of a planet.
For orbital shots too, i want to mash up HQ orbital shots from snowy/icy parts of some of the earth's (pole) regions and other coastlines - which have to be matched and merged.
About the project itself, i just posted 2 test animations with the same simple scene but different settings till yet which isn't very related to actual content or dimensions.
But the scene shows the direction of the undertone/mood i'm working with..
http://www.planetside.co.uk/forums/index.php/topic,16061.0.htmlI'm still at an early stage of the project due to lack of 24 additional hours every day needs and just messing around now reworking my snow and surface/rocks (they are killing me!!) and waiting for needed features and other possible enhancements i hope TG.3 will/could deliver..

Greetings, Alex