This is a really good job. My only point would be the river looks too clear. I'd go with either darker browns towards the shore and black/green towards the middle (for a deep, slow-moving look), and a mottled slate grey (for a fast moving, shallower look). You got to figure even with perfectly clear water-- like mtn streams-- all that dirt is going ot get washed away and you're going to be left with the slate of the creek rock.
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