The cattail plants are inappropriate because it is wetland plant and the terrain appears to lack water in the visible vicinity. I suggest you remove them.
Lol? Sorry but this terrain is far from being VERY good. The trees are taken from WoW and if we remove them it will not be as good as it is supposed to be. But I agree there is a nice tile variation.
Will is correct. If you insist on using pillars, structures hosting moss and fungal growth would be more appropriate. Stone which appears to have been quarried from the region is needed; the black stone of both the pillars and pavement does not appear native to the region and is inappropriate.
What I love is the surreal atmosphere about this terrain yet it’s still somewhat realistic. The variation is extremely well done, just enough to look right without creating a cluttered and randomish effect.
Just do something about those pillars because they look really horrid.