As I mentioned on DA, I think you've got a nice attractive style here with just the right amount of detail for the objectives you set. I can't offer any advice on how to speed up your work-flow since I myself have exactly the same problem as you. My town maps take entirely too long to create, something which I hope to work on in the near future. Very nice job on this, sorry I can't rep you just now.

Cheers,
-Arsheesh