Last night I tried to continue with the current paint pattern, and added the 3rd color...
Absolutely not what I wanted...
After fiddeling around for a while I decided to start anew with the standard Dencara disruptive pattern.
For this I applied a new coat of Terracotta color.
Then I used Ocre to make the base pattern.
this already looks a lot better on the diorama, don't you think?