I don't know if you did or not, but I get the feeling from these that you didn't use a circular polarizer because it looks like there is a lot of glare on the rocks and plants.
I like the comp of #3 the most. The first two's comps don't really work well for me. I would have preferred the FG rocks to be on the right side to balance out the compositions. They feel cramped to the left for me.
The last photo seems to be the worst off with a lot of polarized light flattening out the colours and contrast. Also, the comp for this one isn't as nice as #3. The waterfall feels pushed into the top corner too much and I think it needs more breathing space above it.
I did use a CPL here Green. My mistake was that I forgot to turn the CPL for polarisation to reduce the glare.
I'm sorry if the 1st two photos don't work well for you. If you want, you can move the rocks on the left and move it to the right for me. Nature has its way of doing things, right?
I do love the 1st one and it's going to print on 24X36. The idea of the composition is to go from left to right. If you can take your eye and go left and go up to the falls and to the right and then to the water. It keeps the eye moving. I thought you might have learned this in school since you are an expert in media. I think some will agree with my composition and it isn't as complex however you may see it. Sometimes you are your own worst critique. 

