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.

Click image for larger version.  Name: 15 Snow Peak Sketch.jpg  Views: 91  Size: 157.2 KB  ID: 3761

And this is what I came up with.

Click image for larger version.  Name: 16 Snow Peak.jpg  Views: 71  Size: 156.1 KB  ID: 3763

Compare with before the change.

Click image for larger version.  Name: 14 Gray Mountains.jpg  Views: 96  Size: 152.9 KB  ID: 3762

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.