2 nice and 'fitting' images for the theme but I think you chose the right one for the main thread. The second one has a lovely quality of light, you can just tell that it's winter sunshine with those long shadows and colours.
I'm liking the contrast of the wellies and trousers in your dirty shot.
The stone shot - looks like a stone fish in the foreground, as in fish made of stone not a stonefish. I like the leading lines taking us out to the marker or whatever it's called. Looks like a lovely calm day.
I'm too slow. I saw the fish as well. These rocks look like they have been cut, then I looked up groyne, so yes, these rocks have been cut although I expect the 'fish' is a happy accident. Certainly very 'stoney'.
I like the lone footprint too. Well spotted. For me, it could be a little more prominent in the frame, maybe with a lower and closer pov. All those tide marks/water marks/whatever they are are distracting from the print. Really like the contrasting browns vs the blues of the sky too.