I've begun working on a commissioned map for a novelist friend of mine, and I'm having lots of fun drawing mountains again. In this progress image (actually a screenshot from my iPad, in the app ProCreate) you can see those isometric-style mountains taking shape, and a bit of my process...drawing lots of little chevrons and then connecting them and filling them in with details. I'm always trying to "mix it up" a bit and create more interesting ridge lines, so that the mountain range doesn't just look like a bunch of little triangular traffic cones.

Also, you can see how I'm working the rivers into the mountains. Draw the rivers first, then lay the mountains down around them.

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