Unless it`s on a planet with much stronger gravity than ours, it needs more motion, mist, and the interaction with the river/lake at the bottom.
A waterfall is alive. It bounces off the rocks in it`s path, great leaping gobules, spewing, turning,twisting, laying over itself,turning to mist as it falls, splashing into the reservoir at the bottom, rippling off onto serene calm as it....
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Falling water is a difficult project. You`ve got a good start here, keep us pdated on this one.