Much as I like the detail in the internal arch and the monocrome result, I get the impession that the luminosity is not natural / as was in real life.
Obviously the light was harsh with heavy contrasts, the shadow on the lhs foreground showing some signs of that.
I suspect that the upper levels of that area and indeed across the river were also much mess exposed in the original frame.
I could of course be mistaken and if so, please accept my appologies.
Either way overall it is a pleasant image even if personally I would have to adjust the levels as mentioned above to appeal enough for me to print it.