Not hugely keen on the second two, not sure why though.
However, I do like the first one. It has a sense of depth with the overlay of the softly moving water and the stones. It is calm, but with a fluid motion. It encourages one to reflect upon what they are seeing.
The other two just feel uneasy to me. Not slow enough to create a soft abstract, and not fast enough to capture the raw power of the water.
*All thoughts are solely my own, based on my interpretation upon viewing the images quickly. Feel free disregard.*