An excellent photoreal scene, Bob.
From the thumbnail I thought that was an upside-down pear hanging from the tree; just me being obtuse.
Tree deployment is good for me, but one or two lone trees near the skyline would be even better.
And, yes, I agree with reflective shader applied to riverside stones.
Also, bottom left where dandellO's procedural grass nears the camera, a wee pop of object grass clumps interspersed would be good.
But, great scene as is.
John