thats fantastic! what lens is that?
You oughta know, you own it
Waterfalls are tricky, been doing them regularly for 3 or 4years. I always use a polarizer, hell an ND filter would be very advantageous for me but I only shoot in diffuse light (overcast or cloudy) or either early morning or late afternoon after the sun was set. That one above was late afternoon after the sun had set. Also depends on how hard the water is flowing on how long I am going to expose for. Muliple seconds on a heavy waterfall, it is going to look washed out. Less hard flowing water I may expose for 5, 10, even up to 30 seconds. However, I generally underexpose 1/2 stop, 1 stop or even up to 2 stops to preserve highlights and check the histogram after each shot. Then it is all in the box (photoshop).
Best advice is practice practice practice. What I did.