Hey Paul,
I was just about to send you a message at renderosity if you would like to show and discuss your work over here

I think this is already a very good image. The shoreline surfacing and green details/spots are a nice touch and add to the transparency effects which indeed look good.
I agree with Calico about adding some more elements around and under the trees.
Another thing you might try next time is to reduce the wavescales of the water, I think they are slightly too big. The trees at the shore look nice but could use some higher renderquality-settings and the colors are a bit bland to my taste.
Other things I like about the image are the shapes of the cliffs/rocks and the line-shaped displaced along those cliffs. A very nice touch.
Martin