Very nice set! The best one of Niagra is #3, but the sky sort of ruins it for me in the first two. #5 is interesting- the GREEN grass and the brownish-red clouds.
Of course it is all opinion, but for me, I like the first 2 Niagra shots better than 3. I just feel like the slow shutter speed watergall effect is terribly overdone, and to me, the true power an majesty of the falls themselves comes across much more graphically with the faster shutter speeds you employed in the first 2 shots. Also, the color of the water is very attractive as well. The night shots are not as exciting to me, and the last (although I'm sure intentionally) does seem to be too oversaturated for my taste. But the first 2 are keepers!
