Okay I'll review this...
Review:
To begin with: making terrain, using high quality models does not improve your terrain. Sure, it might look better for the high-res textures, but if it's lacking it still is.
There is various problems going on this map.
Here's a list of problems I noticed when quickly checking the map:
Image 1
Why would you place waterfalls there? It's on the same exact level as every other part of the river.
Image 2
I've never seen it this bad, but why on earth are you placing the grasses INTO the rocks? You do realize it clips all the time and looks really awkward. I'd suggest you to place every object individually on places like that. Looks really bothering. Also, the shore is really really repetitive: rock -> river rush -> rock -> river rush... placed all the time the same way and the same size.
Image 3
Now here it gets the other way: no decoration whatsoever. Why? The area is even so large that you don't just "miss a spot" it's just ignored completely. You can't have decoration placed unequally.
Image 4
This picture might reveal why the grass and rocks are inside one another. Every bunch of flowers are placed with the "Brush size 2". You cannot do that! Place them one at a time. Having them placed here and there, the same way, the same size and the same order (mirrored to each other) looks REALLY REALLY unnatural.
Image 5
This image reveals the same problem and even more: you place the doodads unequally. The red areas are the ones with not a single rock. The blue areas are the ones that have been spammed with rocks. Once again you see the same problem: flowers placed the exact same way. Also, there's only two doodads in the whole forest: shrubs and flowers, why?
Image 6
Now... height variation is also lacking: this whole place is on the exact same level, you need to balance the height variations and make it look more natural.
At the current state I'd set this map either Rejected or Needs Fix. There are a lot of things lacking: awkwardly placed doodads, corners have been cut where they shouldn't have been and lack of using tools such as height variation, tile variation (the roads are make of one and the same tile) and doodads variety.
EDIT: Also, for god's sake - if you are using a tree model that can be rotate why on the earth don't you do it?