Lowering the camera a bit, like Ulco suggested, could work for improving the POV.
I do like that stretch of water in between though, so I'd be careful with adjusting the camera position.
What you could also try is to make the camera angle a bit wider (~5-10mm wider) and tilt it a bit more down.
If the mountain and the flow into the foreground is the subject, then don't use the wider shot to include more sky, but use it to include more foreground. That's my idea.
If I consider the render so far the water would be the least of my concerns.
As you said vegetation variation and surfacing probably deserve most attention I suppose.
Do you work from a reference or just the 'good old' mind?
Anytime you're online here I'm thinking "will he post a new one"?
So I'm keen on seeing where you're taking this one.
Martin