Plenty to chat about before we get to the image. I enjoyed another your little anecdotes about one of the rarely mentioned perils of long exposures that you shared with your original posting of this set. Some four years or so ago I posted a shot here that also featured the handrails on a ladder going over the edge of a jetty. A very different photo to yours but we used similar handrails in a similar way. I was dumb enough to think I could go down those steps and get a shot of the piles beneath the jetty with the water breaking into them. This was not a good idea as I discovered someway down the ladder. Your "feeling tottery" brought it all back.
This is wonderful. Along with others in your series, it should be made into a print.
In no particular order. The complementary colours with the delicate touches of the warmer tones against the darker.
The lines of yellow/gold that intersect on the rails and then a similar intersecting line along the edge of the stone.
The highlights on the steps paralleling the edge of the stone.
The subtlety of an intersection we don't see but we know it is there - on the continuation of the horizon line and the stone edge.
There's a wonderful tension between the total tranquility of the scene and the ladder rails. They speak of action and danger that has been and is to come. But not now.
When I looked at this as big as I could get it, I was puzzled by many white specks that go right across the image in the lower half. I can't see them against the dark sky at the top? I don't think it was on the lens? Possibly on the sensor? If you are going to (and I think you should) make this into a large print, you might want to check this out.