For me the most suitable weather for a stream of cascade shot is overcast, since the contrast between the water and rocks/trees is high enough. This day the sky is clear, and the top-right corner was overexposed due to direct sunlight. Tried using a black card to fix that, but in vein. Another one is the quantity of water is too few, which I had already anticipated. It might be better to do it after heavy rain or in summer.
Anyway as a whole I think it's improved. Version 3 would be available in the future.