Thank you all.
No heightmaps or Gaea
.
Actually the image was supposed to be more about the sky at first. Not that it was complicated.
As you see it is an ordinary one cloud setup with only a standard displacement node. But i liked the look of it.
As i tried a ton of different lower parts with sea and such nothing came out.
Then i remembered my kinda first image with Terragen 2 (
https://planetside.co.uk/forums/index.php/topic,7528.msg80238.html#msg80238 ) and wanted to have another go with a crater scene.
In general the scene is actually pretty basic. The most important parts are strata, fractal warp and Daniil's procedural erosion plugin and merging of kinda similar 2 landscapes (using a surface node for merging made the landscape too smooth).
The rest is detailed placing of the rocks and colour.
I tried a different lighting as i was going for a dark look at first.
The Sun node does have surface lighting and shadowing disabled. The landscape is only lit by the last reflective node and GI.
But i played with the image heavily in post and the end result is from a lighting point quite different.
But have in mind that the node setup you see below does have some nodes from earlier tries and thus some aren't doing anything at all.