I saw another interview you must have done here as well. I'll look over this new one now...
Just thought I'd mention that I recently participated in a round table interview on the Ninja Mountain Podcast. It's a weekly audio show where industry professionals discuss illustrating for the fantasy/SciFi market. The episode posted today and I talked a bit about my cartography process. Check it out if you have a chance.
Great interview. Nice to hear about your process - and, frankly, I'm surprised that your process is purely digital You make beautiful maps.