Echo Rumburak. I would also increase the width of the road, or perhaps better; slide the color adjust that goes into the grass pop such that less grass is on the road (test with the last surface layer). And perhaps in crease the altitude of the reflection on the mud by 10cm or so. In this case it would be nice if the sand/mudbanks show a little reflection.
And try some reseeding of the warper PF, guys! Lots of river variations there.
But I like the subtle sand dunes shining through the grass.