This is very interesting processing. I've looked at this many times and I am torn between loving it and thinking that the processing doesn't work. I'll bump you up one more point.
Very lovely B&W photo showcasing the beauty of the Sydney Operahouse at night. Love the swoop and lines of the building structure you have captured here. The biggest detraction to the photo is the faint odd circular spots that appear in the night sky and the heavy grain that is most noticable in the dark tones of the sky. The spots almost look like there was raindrops on the camera lens. Selective editing and feathering of selection of sky to either gamma & shadow/highlights to darken the sky so the light tones of the opera house pop even more and hopefully the spots would disappear. It not, might have to go over it carefully with clone tool to minimalize or make the circles disappear.