Originally posted by StiffLegged Your shutter speed is in the region where apparently small changes make a lot of difference and it’s well worth experimenting with different speeds to get the results you want. For example, your aperture was f/9, so you can double the shutter speed to 4s without stopping down too much for the same exposure. Or speed it up a touch to get more texture in the water. Use image review next time you try this to see how small changes affect the results while you’re on site.
Global changes of exposure, contrast etc in Lightroom are not going to cut it, learn how to use a brush adjustment for local editing. It’s fun, so keep at it!
I second these suggestions. You might experience the shutter speed within limits like (e.g.) 1/10 - 5 seconds to see the difference in the water. If you only have one ND filter, you can vary both aperture and ISO values to make the testing.
And with Lightroom, the brush tool is very useful to finetune the lightness and clarity/softness of the water.
Anyway, your first time ND pic is very nice!