I'm almost there. I've resized some of the building blocks and then rendered the ships a bit. I also turned the flag inside out because the flag design got lost in the previous versions.
The light effect was created with an overlay layer on top of a color dodge layer. Those were covered partly with a smoke layer which really is just a custom cloud brush in various sizes and colors.
I'm almost finished, but I still need to work on the foreground and the settlement on the left.