Expanding on what wrote - I think a material for the shore with some specular/wetness to it would be nice.
For my part I think the foliage/forest is a bit too uniform - the canopy seems to be at a consistent height, which is really noticeable. Put in some more scaling especially on the Z axis so you can get a less-uniform canopy and it will look nicer. I also think making a varying the leaf material’s shade of green will help a lot.