I really like these type of scenes, depicting vast spans of grasses and thereby showing nice scene scales.
My only suggestion so far would indeed be to see if you can spice up your clouds.
Don't make them too noisy as it will influence the tranquil look of your scene.
Perhaps, this scene could even do without clouds.
Personally I never add clouds, only when I feel I "need" them.
Except, of course, when I'm making a render with clouds as subject of interest.