Cool work NVSeal!
Like the composition on this one...really draws you into the river.
I agree about the texturing and with you about the plants.
Maybe a more uniform base of 3 colors (low contrasts) will work better and then touch it up with brighter and sharper contrasted colors on specific heights and slopes.
Just a suggestion/example.
I really like the displacements on the upper parts of the canyon.
Would you like to share a screenshot of the nodesetup of the terrain-nodes?
Thanks in advance

Martin