Getting a good photo isn't just about finding a waterfall to kayak over and having someone take your picture. It's a lot more complicated. Below I've outlined what I do on photo shoots.
First, find a good photographer. I try to use Jock Bradley as often as possible because I know that he always gets the shot.
Then we talk about the paddling gear I will be wearing. The objective is to wear gear that will stand well (contrast.)
After getting to the falls we have a discussion about what angle he will be shooting from. Based on that angle we determine what part of the falls I should go down to make the photo look as spectacular as possible. The photographer knowing the exact spot you will be falling, will make their job a lot easier.
Next, we discuss what boat angle I will have and which side of the boat I will be taking my last paddle stroke on. We also discuss body positioning. The objective of this is to make sure that my profile is exposed towards the camera.
We have a good system using hand signals so that the photographer always knows when to expect me at the lip of the falls.
The final step is getting into my kayak and doing exactly what we have discussed.