Thanks for this answer. I made some changes and it now looks better.

I have yet another question: there is a material I like in Vue that is called "natural 3". A mix of a brown moss like material and a clearer stone like one. Very interesting for images of the Highlands in winter for instance.
When you render it, the brown material clearly looks as if it were above the other. It does this even if you swap materials. Is there a way to make the brown material appear to be under the other?

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