It looks gorgeous to me!
But I’m more of a Game Designer so I’ll leave the technical art part to those who can speak about it.
But I had something in mind while looking at your picture. Level Design & composition. What makes RPG landscape great is that they manage to both be beautiful and lead the player to the right spot.
I’ll just leave a link here and if you’d like to dive more into level design composition you can start right here.
For an example:
That picture:
(as a player)
Where should I be looking at? Where should I go? What paths allow me to go that way? etc…
Have a good day, keep up the good work 