This is fantastic. I've actually thought about my dream pool and this has a lot of the same features. I especially like that you'd be able to do some "cliff jumping" off the waterfall. I think many designers go for the slide and forget how much fun kids have just jumping into the pool. Did you consider anything for lap swimming? Like you, I prefer the natural looking design, but one consideration I had was to try to make sure the areas perpendicular to the longest distance across the pool were on flat areas. I also though it would be fun to have a small rock climbing wall on the side of the waterfall. Just make sure it's greater then 90 degrees, so you don't catch your chin on the way down. Still like I said, this is pretty close to my dream pool. Nice work.

PS: I manage the pool in my community.