Really amazing work! I enjoy the euphoric colors and the night coming in from the side. The transition from night to day could perhaps be a bit more gradual though. I reckon it would give the center part a bit more interest, as right now most seems to be going on at the sides. So it's a rather unusual composition in that aspect, although I have to admit I tire from seeing the main focus in the center of a composition; I'm very guilty of doing that, but there are certainly more interesting compositions one could come up with. Yours is great, but a bit more going on in the sky might have been even better.
What I find particularly remarkable about this work though is the style and the use of white space. I know white space is more important in watercolor than in any other painting technique (except for pointillism) or medium, but this work resonates in particular because there relatively large spaces left unpainted. That, and the use of watercolor and euphoric colors strongly reminds me of the kind of paintings a child would make. Obviously your work is very well crafted unlike a child's, but it provides a certain nostalgia. Very pleasant work to look at.