I really love this map. I don't like to comment too much because I'm still pretty new here, but I had a couple ideas.
Regarding the clean vs dirty version: I like the clean a little better, but only because I think the dirty version looked a little over-rippled. Seeing that you can remove that effect pretty easy, have you tried using a regular "ripple" filter (set around 20-25%) instead of the "ocean ripple"? I think it has a more subtle effect.
On a different note, the trees in the districts NW and N of the canal look like they are missing shadows (they sort of look like piles on the ground rather than tree leaves above it).
Regarding the monotone version: I'm thinking of converting my Oten-jo to a sepia color after this challenge for a more classic antique styled map, so I'm curious about your method. I like it a lot, but is there a reason you blurred it or was that an effect of the process you used for the look? I'd like to see a non-blurred version if possible.