my first attempt at long exposure

[conropl]

Busted Knuckles hit most of it on the head.

First of all, your shots look good... so my comments are more informational.

1. If you have a CPL, then use it when doing moving water shots like these. This is for two reasons:
   
   • There is a lot of reflected light that comes off wet rocks and vegitation, and they get washed out and you lose a lot of detail. You will notice a big difference in the shot if you use a CPL. For example, if you look at your first shot, the rock on the right side of the foreground has a wet spot that has a reflection that losses the detail of the rock. You can see the same thing in the moss and rocks on either side of the riffle that empties into the pool. Those areas would be very clear and colorful if you had used a CPL.
   • As Busted Knuckles said, at f/32 you are getting significant diffraction. I know on my lenses, if I close down more that f/16 or f/18 (depending on the lens) I see noticeable blur due to diffraction (ideally you want to be at f/8 - f/11). By using a CPL it does cut down the light by 1.5 to 3 stops. That would allow you to open your aperture another couple stops to get sharper detail.
   
   
2. On fast moving water you can get away with a shutter speed of 1/4 -2 seconds and still show good motion blur. So if you used a faster shutter speed, then you could open up your apertue further yet.
3. An ND filter would top things off nicely. Not so much to increase the shutter speed, as to get the aperture opened even further, and then whatever room you have left in the exposure, you can increase the shutter speed.

Overall, very nice shots. You have to be loving that lens. I remember taking a lot of waterfall pictures with my kit lens, and then when I got some good glass, I had to go back and retake everything because they just did not look good anymore. Watch out... I think you are coming down with "L" disease.

Pat