How to improve your photo
Most of the things here that I see you could improve on are related to composition. The composition here is not bad, but doesn't, I feel, provide the impact that another point of view might have given you.
Consider trying to find another balancing object in the foreground to frame your subject (the waterfall). As it is the image, as beautiful as it is, feels off balance and weighted to the left somewhat.
I think that as you said there is a natural leading line into the cove where the waterfall empties, but I feel like one needs to see more of the inside of that cove. Perhaps moving a little to your right would have provided you with a view that draws the eye deeper into the frame by allowing you to see deeper into the cove between the rock formations.
The framing object (tree trunk and branch)on the left side might have worked had the tree trunk been a bit a bit more vertical, and the branch angled more upwards and not across the face of the waterfall. Even a one sided frame works if it is balanced. In this case the large branch, had it not fallen diagonally across the waterfall and then immediately off the page, but rather angled up, clear of the main subject and then perhaps across the top of the frame somewhat, would have created a viewing area that leads the eye directly into the frame rather than out of it.