Some Cartouche options for the ("empty") corners outside the Hex Center could also be a good addition to the style.

north-facing cliffs are also a good addition to the style.

If you want to make it even darker, you can create a Sheet on top of the Sheet of Sea Contours 2, 3, 4 etc and control the edge fade inner. This way they won't be superimposed badly.

Colors are very strong <3

This can also be achieved in other styles by increasing the size of the mountains and decreasing the size of the trees. I use this technique a lot when working with Mike Schley, for example.