Hi Peter,
I wondered what prompted the dogged use of f/16 and ISO100?
#1 seems a little dim, although I accept the histogram looks OK, because of the small bright area on right, for me the Patti are just a bit too central compositionally
#2 does have a fair bit of bland sand foreground, but the overall ratio kind of works, so for me, the issue is one of the location within the frame of the 'foreground interest' subject. I wonder if you could have shot this view from a little closer to it, so it was lower in the composition? (but in all other respects, they shot would stay the same)
#3 is my favourite, the only thing that detracts for me is that the same comment I made about sharpening in your
Lochan na Lairge shot applies here; too wide a radius and slightly too much amount. In other respects, it really works; with some decent clouds to balance the foreground.
#4 my eyes are drawn to the foreground sea foam, I'd have cropped it all off, which I also think gives a better composition of the wreck - which I assume is Patti again?
I hope those thoughts help - and don't appear too critical.
PS I hope you found your specs, although looking at the terrain, that might be tricky.
All the best, Dave