Thanks all, and thanks for reminding me of this thread.

I did some more doodling, mainly a study of perspectives with mountain ranges. The forests serve to demonstrate how other features would look with those mountains.

The missing shading/coloring (that's another issue I'm currently struggling with), how messed up is the perspective of those bottom ranges? I personally like em better, because it lets the observer kind of look "behind" the mountains, but I'm unsure as to if that perspective is "valid".

Click image for larger version. 

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