Okay, so today I've been tweaking the granite mountains. I wanted to to create the appearance that the areas outlined in white were higher than the surrounding granite peaks.

15 Snow Peak Sketch.jpg

And this is what I came up with.

16 Snow Peak.jpg

Compare with before the change.

14 Gray Mountains.jpg

Basically, I duplicated what I did with the hills layer - I created the height map and did a few bump map layers based on that, but didn't add a color layer. The effect is subtle, but I think it does what I wanted it to do - creates the illusion that those areas are a bit higher than the rest of the mountains.