I recommend to keep tweaking this some more. The overall impression is very nice, but
1 - you seem to have turned of rotation of population instances for the grass. Looks like the field has been combed.
2 - I'd work on the cloud shapes some more, and maybe on they fractal distribution.
3 - the colors could be a little more "dynamic", but that may have been your intention.
other than that, lovely scene!
Cheers,
Frank