On #2, I find that I need to see the full-size image to really do the picture justice. The small image just doesn't allow the spider web to show at all.
On #4, I'd prefer a landscape orientation that shows the top half of what you have and brings the two falls into better focus. The foreground is pretty, but it doesn't add anything to the picture for me.
If you had concentrated on the falls alone then portrait orientation would have been a natural setting for this scene. However, since you seem to be wanting to include more of the cliff face as your subject you need the landscape orientation.