I'm glad you got out of the car and braved the rain. For me I sometimes think about the shots I missed because I didn't put in the extra effort more than I think about the shots I nailed.
I think the composition of the first shot works as it is. Too often I see waterfall shots that have no context, it's just a shot of the waterfall itself with none of the environment included. Those types of shots lack depth as there is no natural path for the eye to take through the photo. For that you need to include, as you did, the environment that the waterfall is in. However, as is often the case in waterfall shots, you are shooting in flat light with lots of foliage that makes for a very "busy" scene . When all of the foliage is receiving very flat light so that it is all evenly lit the eye doesn't know where to go and bounces back and forth all over the frame. I think that is the case in your shot.
For these types of photos I like to "simplify" the scene first by darkening it in RAW with the ultimate goal of shaping the light to create a path for the eye to take through the photo. By first darkening it you create a canvas on which you will paint your light and you also remove a lot of the distractions that the busy scene inherently has.
Each photo is different, but in general for these types of forest waterfall shots I would first decrease the exposure in RAW until it looks even a bit overly dark. After taking it into PS I create a path for the eye to travel through the photo. In your photo that would be by dodging the waterfall and the area on either side of it. This is of course a broad oversimplification but I think it gets home the general point.
There is only so much you can do with a jpeg but below was my stab at doing that with your photo. I hope you don't mind but if you do let me know and I will remove it. There was a strong green color cast which I removed/balanced with a green curves layer and a color balance layer. I found that the reddish brown color of the dead leaves and their overly bright appearance distracting so I cooled them with a photo filter adj later, darkened them and decreased their saturation with a Hue/Sat adj layer. The greens in the leaves looked overly punchy so I decreased the green saturation with an adj layer.
Then it was all about shaping the light with some dodging and burning, trying to keep the focus on the waterfall and away from the edges of the photo. I also added a tiny bit of a bright blur to the very top of the photo in the center. The edits can be more easily seen by clicking the little eyeglasses on the top right of the photo to view it on a dark background.
I think you have a really nice composition here.

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