I was interested in applying, for the heck of it, to see if my skills were adequate.
That was until I saw this:
The left part is a section of your tileset. A section in which, probably unbeknowingly, whoever made the tileset turned a great, useful tile into a common cliff end piece. This was not needed, as the correct piece for what you intended already exists in another part of the tileset.
On the right is what can be done with the selected tile when using a normal tileset.
Anyways, this isn't an attack or anything, I like your tileset alot, but hardly ever are tileset makers LATs, and thus minor discrepencies like this occur.
If you ever want super sexy cliffs, I suggest fixing the tile.
Good luck with your applications, from what I've seen, Zenkou looks to be a nice, original playerworld.