Check out where I circled in red. They are some errors with the cliffs, they can be fixed with the correct tiles. You just need to look around.
Circled in blue are some things that I thought should be changed.
For the stream, you can find (~)tree trunk npc to put there and have the water come from below it, and sort of go under the path and on the other side, remove the bush and make that a small pond.