Thanks. @Martin; the mud is displaced on a very small scale, and you see that more defined in the RT-reflected mud. I should have softened that as well, or smoothed the mud more... forgot. I did soften the water reflection though. And I think the transition between RT-and nonRT reflections might be a bit softer.
If you mean the light/dark that 'just happens', yes, it was pure luck that the trees were where they were, so I kept it that way. I basically wanted to test the new Carex species and made a small pond... added some stuff, you know how it works. At first I had different shrub, but they were awful, so in the meantime, I made some new ones.