Everything seems to be too randomly placed.
Like the rock and the tree next to each other?
This screenshot is pointless since it's a battle already in Essentails for test purposes.
For a route, this area is too open spaced, and the tall grass(I think...) looks a bit iffy.
My only thought is the map is a bit open spaced for a gym? Is it a gym?
Is there any point of that grass, if your on the water?
All in all this could use some work, but i'm sure you can do it.
Good luck.