Indeed a nice Andromeda capture.
There is nothing more interesting that painting the background with light when you have good sky and location.
You have it all. Only reduce the intensity/duration/passes of light painting and balance that with sky (A tad darker foreground, that you would like to see on cameras LCD. Also different color temperature LEDs or a gel filter / color filter or any modification in that regards, could be really rewarding.
Must admit, you are lucky that your son listens to you and helps you with creation of memorable images. How I wish mine would play less on console...
Have fun and post more.