Photographing waterfalls can sometimes be a bit tricky. I prefer the cotton candy looking water. To get that look you will need a couple of things. One is a good sturdy tripod. Second is low light for a longer exposure. There are many ways to create a long exposure, but I will go over some Waterfall Photography Tips.
1) Use a small aperture. Shooting at f.16 or f.22 will block out the light and give you that depth of field that is the signature to good landscapes.
2) Shoot with filters! In this photograph I used a circular polarizer. This does 2 things for my photograph. First it cuts down the light by about a stop and second it takes the reflections out of the water. Notice how I can see the rocks in the stream. Without a polarizer the stream would have produced glare from the sun. Another filter I use is a Neutral Density Filter or a ND filter. I have a couple but the one that I use most is a 8 stop ND. This will help give me the cotton candy look in just about any lighting conditions. Even in midday sun.
3) Shoot in the shade/ early morning/ late evening. There is less light and will help you get the look.
Use your imagination and make pictures. I made this photograph. I stood and set up my tripod in the middle of the stream, don't be afraid to get dirty or wet. I needed a tripod because it was a 13 second exposure. The rock in the stream, the orange leaf. I put them there to create the composition I was looking for. Is this cheating? Not to me it isn't. When I finished taking pictures I took the rock out and held on to the leaf for a few other shots I wanted to make. Use the resources around you to fulfill your vision. Photography is about creating and creative thinking.