Here's an image of Spruce Flat Falls located in the Tremont area of GSMNP. This is a really nice waterfall with the upper section being about 30 feet tall. It is about a mile hike to get to, however. The trail for this fall begins at the Tremont Institute.
I took this image using my Tamron 15-30mm lens and just got as close to the water as I could. You can't shoot these waterfall scenes without a circular polarizer. I used a special filter mounting system designed for the Tamron 15-30 by Vu Filters. It allows me to have a polarizer on that lens. I can also add additional filters if needed, like a neutral density or graduated filter.
Sony A7R II, Metabones Adapter, Tamron 15-30, VU Filters Polarizer, Sirui W-2204 Tripod and K-20 Ballhead.
Aperture Priority, F/16, ISO 100, 2 seconds, 16mm