Thanks Kacey!
Is there any chance we'll ever see a tutorial on how you make you're shaded relief? I would love to know how to do this.
Sure!

I only use the airbrush tool of krita (of the old set) at opacity 1 and black.
I turn the 4 layers at "burn", opacity 35%. I generally use the previous layer at burn 100% to draw the next one on it (draw the step 3 on the step 2 at burn 100%, for example).
You can play a lot on adding details or not for reinforcing or not an area.
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1 : general topography
With the brush at 10 pixels wide, just the main lines

2 : more details
Brush width = 5 px
Addition on the main lines, plus some secondary ones.

3 : more details
Brush width = 5 px
additional details & reinforcing shadows.

4 : details
Brush width = 2 px
A lot of lines to gave more rugosity and underline some elements/ridges even more strongly.


On a different note, I'm still messing around with the land colors. I think I'm hesitating too much between too very different things...