This render is coming along!
I wasn't happy with how the volumetric material for the waterfall splashes looked, so I re-did those. I also pumped up the red and yellow contrast in the trees, and added some hedges.
I want to make some additional objects, like benches, lights, trash cans, etc. but I'm a bit worried about the can of worms that might open up. I've never done a proper scale test with the parts in this scene - that is, I've never dropped in a 2 meters tall human shape to see how things look in proportion - so I've been reluctant to add objects like that.
Just eyeballing it, things look mostly right. The hedges seem a bit chunky, maybe. Editing the width of them would be a pain, but... now I'm tempted. Maybe something I'll do further down the road.