13h? Oh wow!
What if you just deactivate clouds for experimenting with the other changes?
Very nice scene and beautiful lake!
If you have the patience to play around with the project (and while doing this switching off the clouds) you can surely easier improve some things.
Just 2 ideas /suggestions from me:
A layer with little fakestones and a layer with darker color at the hight of the water.
If you make the man smaller, don't forget to resize the tower too
Good luck