Both are nice and not at all bad for getting your feet wet with these shoots [no pun intended]; I think the first one works better in this case than the filtered one.
I'd suggest:
- De-centering the fall itself; it's a bit to centered both vertically and horizontally here.
- Include less sky and more of the stream; since there isn't anything interesting in the sky, I'd have dropped the angle a bit so that a little less of it was in the frame and more of the stream where you'd have some additional texture going on.
- I don't know what exposure settings you used, but using a smaller aperture would have given you a little better sharpness in the trees in the background. As it is, there's a little too much blur back there and my eyes keep trying to focus better; it's sort of jarring.
As for the filtered shot:
- The magenta color cast is way too heavy; I'd work on processing that out.
- This shot appears a bit overexposed compared to the first one, as well; notice how the sky went white instead of blue?
- After putting the filter in place, did you refocus? The image just looks fuzzier, overall.
- The long exposure motion here doesn't work as well, for me, as in other shots, simply because the size and makeup of this fall "feel" like you should see the actual definition of the water better (it's smaller and shallow).