Nice images Mike. I agree with the other comments about waterfalls so often photographed with much too slow a shutter speed. Water has movement and needs to show that and you have captured it well. My only comment o/w would be about image #3 and the rock in the foreground. I can understand not wishing to leave it a mainly a black blob due to the backlight of the overall image but having made it so much lighter with so much more detail than other parts of the scene, the eye goes to this large amount of spatial imagery before getting to the waterfall. Perhaps before you print you might consider trying to tone down this area and even perhaps adding some blur to it so the eye does not come to this area first when viewing the overall image. Just a thought for your consideration.
I will have to think on that. I thought it kind balanced the darkness of the left side of the image, but I can see it might distract. I think I will have to see it in print before I decide. Luckily all of these are saved in PSD file format, so I won't have to re-tinker too much.
Creyr Glas Lightworks