Maybe another suggestion?
All tilesets except Ironhand have some duplicate wall tiles. Literally the same graphics, although they are used differently in the game. Some of the are wall-to-wall and other are wall-to-natural-rock. Your set has 4 tiles that exist 3 times, looking the same, although they could look different and would improve the look of a fort.
I did a quick mock-up with paint to show exactly what I mean:
Suggestion: Make 8 new tiles for the ones I mentioned, and blur the most common inorganic/rock tile you have into these walls, so that you have a natural, flowing progress from smoothed wall to natural rock wall.
I've considered that suggestion, but I do not like that style for multiple reasons.
Even in ASCII those walls terminations are only walls, not wall/stone hybrids. ex: ╘════╛
Also, I cannot represent the appropriate stone texture for the stone type with it's specific foreground and background colors.
I think I'd rather just change those wall ends into pillars. Doing so could also save one tile as I could use one of those 8 tiles in replacement for the tile I currently use for the normal pillar.