Hi Anton,
To pick up on something that immediately attracted my eye, the blue highlight on the railings - I'm not sure if they are painted fairly light blue and it only shows properly under the lamp, or whether that blue colour is an artefact of blown specular highlights on a shiny surface.
I raise it because I found with my Canon S100 (fancy P&S), I had to deal with quite a bit of blue coloured blooming around the light sources and metallic reflections in scenes like
this and
this. Mind you, I cheated and shot mine without a tripod
Good on you for doing it properly.
However, it is a VERY good effort, definitely one to be pleased with.
Well done,