The slow shutter speed is a very good idea when doing water... it gives it a nice effect.
But when you are slowing your shutter speed, you need a tripod for crisp images.
The first two images dont seem sharp at all. I like the composition of the second, but the blurryness kills it for me. They are grainy, even though you said you used a low ISO...odd. I dont have an EXIF viewer at work, so what were the settings for the shot?
The last, like you said, you missed the focus. Well, the focus point is further back, and due to the wider aperture, the front is blurry.
Seriously consider redoing all of this with a tripod. Keep the ISO as low as possible, set your aperture to smaller so you have more in focus (f/11 or so) and let the camera decide on the shutter.
I used a tripod with a wireless release for the first three. The blurryness could be a combination of slightly missed focus and noise reduction. I was going for hyperfocus on the first three as well and could have been off on my measurement from the camera to the water.
EXIF is:
1:
Camera Maker: NIKON CORPORATION
Camera Model: NIKON D3000
Lens: 50.0 mm f/1.8
Image Date: 2010-09-06 05:50:53 -0400
Focal Length: 50.0mm (35mm equivalent: 75mm)
Focus Distance: 4294967295.00m
Aperture: f/2.0
Exposure Time: 0.0031 s (1/320)
ISO equiv: 3200
Exposure Bias: none
Metering Mode: Matrix
Exposure: Manual
Exposure Mode: Manual
White Balance: Manual
Light Source: Fine Weather
Flash Fired: No
2:
Camera Maker: NIKON CORPORATION
Camera Model: NIKON D3000
Lens: 50.0 mm f/1.8
Image Date: 2010-09-06 05:51:01 -0400
Focal Length: 50.0mm (35mm equivalent: 75mm)
Focus Distance: 4294967295.00m
Aperture: f/2.0
Exposure Time: 0.0031 s (1/320)
ISO equiv: 2200
Exposure Bias: none
Metering Mode: Matrix
Exposure: Manual
Exposure Mode: Manual
White Balance: Manual
Light Source: Fine Weather
Flash Fired: No
3.
Camera Maker: NIKON CORPORATION
Camera Model: NIKON D3000
Lens: 50.0 mm f/1.8
Image Date: 2010-09-06 05:57:02 -0400
Focal Length: 50.0mm (35mm equivalent: 75mm)
Focus Distance: 4294967295.00m
Aperture: f/2.0
Exposure Time: 0.0063 s (1/160)
ISO equiv: 500
Exposure Bias: none
Metering Mode: Matrix
Exposure: Manual
Exposure Mode: Manual
White Balance: Manual
Light Source: Fine Weather
Flash Fired: No
4:
Camera Maker: NIKON CORPORATION
Camera Model: NIKON D3000
Lens: 50.0 mm f/1.8
Image Date: 2010-09-06 06:07:00 -0400
Focal Length: 50.0mm (35mm equivalent: 75mm)
Focus Distance: 4294967295.00m
Aperture: f/2.0
Exposure Time: 0.0063 s (1/160)
ISO equiv: 360
Exposure Bias: none
Metering Mode: Matrix
Exposure: Manual
Exposure Mode: Manual
White Balance: Manual
Light Source: Fine Weather
Flash Fired: No
I did set it to ISO200, but the settings I had allowed the camera to override it if it thought the iso was too low.
I will try again tomorrow if it isn't raining. I will also use a smaller aperture too. Today, I was pretty much shooting wide open. Mostly just messing around to see what I got.