Why did you choose to lower the ISO and go for a 10 sec exposure ?
I think the smoothing of the the water begins to work but perhaps a ND filter and an even longer exposure would be better if you were trying for a fog effect.
If the sea was a bit rough then I would have chosen a short exposure to show the details of the collision of the water with the sea. Just my take.
I am jealous of the location - sure beats cold cheshire UK.