Whassup NelmR.
My choice would bethe first picture...on one condition: that is if the branch leading out to theright from the treeis eliminated. I don't knowwhy I find it distracting but it doesn't work for me. It seems to upset the vertical lines too much. My immediate senses are telling me, even after viewing it a few more times, that it in fact does upset the rhythm here.
I scrolled the branch up to the top of the frameto make it almost unnoticeable but once I did thattoo much valuable space at the top of the scene was wastedbecause there the branches filled in more of the scene. :-)
The second picture offers a nice touch but my eye was continually drawn to thatslender tube-like tree between thetwo big ones which are framing the falls. And I have to tell you, honestly, I didn't notice it at all in the first picture.
As a landscape/nature photo it should be left alone I guess. On the other hand, as a photographer, you,it seems that nature has to be overidden, in this case position-wise, at least to me.I'm trying to fit it in but I can't do it correctly. There may be another answerfor my uneasiness about the little dude but...
...maybe the answer is simply because the three are at odds with each other and should be recognized as such. After all nature has its oddities, good photography notwithstanding.
Maybe if the waterfall had a lot of water cascading over it my eye wouldn't have been drawn to the tiny tree. I'm just grabbing at straws here.