I agree with Joel.
Don't you use a CPL? With wet rocks around waterfalls, the CPL gets ride of the glare to bring out more rock detail and helps metering (gets ride of the hot spots). The rock shelf in the vertical shot (mid frame, right side) shows a lot of light glare. The CPL also gives you another 1.5 - 2 stops of light reduction. However, I really like that shot... a CPL would just be a small tweak in a really nicely composed shot.
I am pretty sold on CPL's for waterfalls... is there any reason you do not (did not) use one? My problem with CPL's is when I switch to vertical, I forget to reset the filter.
