Yeah, I've been studying the DF 2 and 3 World Maps since I started working on my own, and I've gone back in recently and really fixed it up. One thing I failed to take note of in the past is that there are no real "patches" of anything. All of the tiles (mountains, hills, etc.) are all laid out in giant blobs/clumps. Mine's too patchy, so I made sure to fix that.