Ok, so here's my take on your panorama, which I like quite a lot - I would say there are some things I would do to improve it. I love the panoramic format, and this shot shows great use of it. Composition-wise I think the image should have been panned to the left. There is a very cool ellipse shaped path from the sun, through the clouds, down the waterfall, and down the river again meeting the sun. This is great stuff, mesmerizing in fact. The big issue for me is that the Sun is too near to the right side of the image. A little bit of more image to the left would improve the overall composition. If you couldn't do that, then cropping to the right would most likely balance it. The dynamics of the waterfall are a great foreground subject. You may have considered the tree to this avail, but actually it's the waterfall that grabs the viewer and leads the eye through the rest of the shot. The tree actually is confusing the composition, but that's not too bad. As for what I really am not fond of: excessive apparent sharpening and the use of vignetting which is darkening the image.
That's a really nice shot, the warm tones and strong background sunset help making it.
I guess I find the foreground waterfalls could be somewhat better in frame (maybe tilting the frame towards the bottom-left corner, lowering your POV would make those falls huge!!), and less obscure, so that the viewer has that has a very distinct foreground subject that draws you to the powerful cloudy background in the back.
On the background itself I'm not too sure if the sunset colors are *slightly* exaggerated.
So basically the developing could be better, and maybe the composition could improve.
On the plus side, the subject has good originality and vision - not everyone will see that rock as a setting for what appears in your shot, and also it requires some good overall knowledge.