I would have loved #1 over all of them had you given the top some room to breath.
As it is, it's a very unnatural border and, as a result, creates a sense of visual discomfort.
Relax Kimosabe, it is a first run on long exposures. Perhaps read the thread..
Wow. Do you want honest constructive criticism or someone to blow smoke where the sun doesn't shine? I agree with
Sleist that the first image look like it might have potential but the crop is too tight and the foreground has little interest. You needn't have shot at f/22 here. The 25 second have flattened the foreground too much so there is no shape to it. I would look at reshooting looking at focussing a third of the way in at f/8 or f/11 to get the exposure below 10 seconds so the foreground has some shape. Better still get it under 5 seconds.
With waterfalls I use half a second as a starting point. As others have said the optimum exposure time will depend on the flow of water.