I call this kind of shot "shadowplay". I see what attracted you to this. I think a tiny bit more black at the top would tremendously reinforce the shot and what is actually happening here with the light and shadows. That thin sliver of black at the verrrrrry top of the frame is not enough to really throw emphasis onto the large light pool here. But then,OTOH, I can see you've balanced the thickness of the thin yellow line at the top with an equally thin black line at the top, in an echo of the central black/yellow line pair. So maybe that was deliberate.
I enjoy these kinds of shots. To me, if I had to really analyze this, I think what would help a lot is a more-open shadow rendering on the right hand side; to me, the shadow on the railing goes from the sunlighted part of the yellow-painted railing, and then into a deep black zone that is simply too abrupt, too "dark", and not quite the way the human eye would render it. It's just too abrupt in contrast. I'd add fill light in post, then tweak the curves and re-adjust the blacks, to hit a more-realisitc, more "human-eye-like" rendering of the sunlight/shadow juxtapositions.
