Really nice shot, Kees, but I have to say, when I first saw it I had to wonder what it would have been like with a 10 stop ND and some movement in the clouds, and the water. That said, the water's stillness tells me that you could have sat there all day shooting 10 second exposures and still got next to no movement. As others have mentioned, there's something I can only call "incomplete" about the composition that makes these wonderful elements feel "off" just a little. More sky? More foreground? Shallower DoF focused on the foreground rocks giving less definition and prominence to the lighthouse and sky? I don't know. Still, like many, it should have done better.
I really like lighthouses and this is a lovely capture of one. I'd like to have seen a versions with a bit more sky above the lighthouse to see if it set it off better - but not at the expense of those imposing rocks!
i would have liked to see a deeper slice in focus, and if the rocks truly the champion of your shot- them maybe a different perspective that didn't divide attention. otherwise a good shot.