For the final render I've asked for the corals to be more branchy and that was it. I deliberately didn't suggest anything in implementation or composition to avoid contaminating its idea.
I've been iterating to get an unobstructed camera angle, tweaking a few parameters to my liking, but the bulk of the code it made by itself.
It's actually pretty capable. The first images were simple, but had a point. Having seen the result it proposed a few tweaks. And after getting the sources for example scenes and elementary functions it picked up more stuff to its satisfaction.