In the first image, my exposure was ISO 200 f/14 @125th of a second.

With the neutral density filter in place, my exposure went from 1/125th of a second to 15 seconds. With a super long exposure, objects that move such as water take on a surreal look.
 I actually prefer converting long exposures into black and white for a more dramatic effect. Here is another long exposure at Garrapata Beach.  The exposure was 20 seconds on this particular image.
I actually prefer converting long exposures into black and white for a more dramatic effect. Here is another long exposure at Garrapata Beach.  The exposure was 20 seconds on this particular image. 
 
 









