Sixth version is, once more, a great job.
Elven housetrees are great, and ruined tower is.. woah.
It's the greatest tileset I've seen ever and I use nwvault tileset since 5 years... Here it goes some ideas to do it more ouuuh! if this is possible ^^:
-More housetrees structures. I think it's impossible to do two walkable floors, but if you do a rope bridge up high comunicating elven trees and down unwalkable bushes could be great. A huge tree with natural wood stairs to up accessing.
-Tree and bushes thicket for delimit area sides.
-Possible paint cliffs next to water. Thicket too. This is useful delimiting.
-In chasm, stoned downstairs. Not for accesing bottom of chasm (u did not walkable and I suppose this could be difficult to remake this), downstairs to access some kind of stone balcony, maybe a door transition approached to cliffside...
-Watch tower with usable stairs.
Sorry for my English :S
If u need more ideas, tell me please
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