Hey Stephen,
A nice city shot with the lights there. The first thing I noticed in the sky was the darker blob of blue sky, almost like you had a polarizer adjusted too much. I think I would darken the cyan in the sky in this. Not only would it help with the transition in the sky it would also darken it as this almost feels like a day time shot, but with a darker sky I think it would feel more like a night shot.
Jim