Cen Heddan - colouring an oldie

[Blaidd Drwg]

I decided to pick up on one of my older maps (one of my first, in fact) that I never really finished. I tried colouring it once before, but I had no idea how to tackle it.
Here's a new attempt, with much taken from Torstan's tutorials.

The old version:


And how it looks at the moment:


Shading the rock that this town is on. Black and white (brush pressure sensitivy set to pen pressure) on two overlay layers to build up the core shadows and highlights.