Originally Posted by
crisscross
This bridge looks a great subject Dan, especially the chance to frame the far arch inside the near one as in the 3rd shot. If it were possible to shoot from a touch right and lower without being run over, it would get the framing perfect. As a former architect I have no problems with symmetry (apart from spelling it) and think there is a place for ignoring all the photographic off-centre theory of composition.
I have no ideas on the night photography technicalities, but you seem to be doing well from results. As Bill says, it would be nice to reduce the impact of the light in no 3. No idea what PP software you have to hand, but if it includes potential to work on a selected area only made by a soft brush, you can tone lights down a lot by (a) reducing contrast and/or brightness (b) semi-opaque painting rather than near impossible clone. Easier to do if light can be positioned either right on or right off masonry. Similar soft selected area to remove areas of green (or other unwanted tinting), possibly colour temperature rather than white balance and best done in PP rather than on the camera asuming you are shooting RAW.