That's a good start

The first thing I noticed is the "leaning" cloud.
I like the cloud placing and coverage, so fixing the leaning cloud will probably affect this in a negative way, not sure.
If this is just flooded then the water is a bit muddy I suppose.
Perhaps a muddy density colour and density value of 0.25-0.75 will give that bit of muddy look while still allowing to see the ground surface through.
You can't see that now, because the water is completely reflective, so I'd reduce that too.
Last thing is perhaps some billowy terrain shape to make the overall appearance a little bit less super-flat.
I'm thinking about displacement amplitudes not bigger than the tallness of the grasses. Really just a little, perhaps just half the height of the grass.
Seems enough to me for now!

Looking forward to your next iteration!
Cheers,
Martin