For this image I wanted to try and recreate the long exposure look that the reference image at the bottom of this page has. I overlayed 7 different frames of the simulation and blended them together to sort of mimic the effect.
The mesh of the waterfall rocks was sculpted by me, but the texture is a substance painter rock generator by Pierre Fleau from Substance Share. https://share.substance3d.com/libraries/1002
This was the main reference image that I used.