>>9565020Gonna be very hard to do without an airbrush. This is achieved with a nice black base and then slowly layering semi-translucent layers of different blues and purples. Follow this up by handpainting the stars with a VERY fine brush (I'm talking like at LEAST this fine). Don't go about it randomly, our brains try to find order automatically so you will likely make them too uniform. Try to find a good picture and copy the star distribution.
That's about it. You COULD maybe conceivably achieve this with rattlecans, but it's doubtful you'd get the kind of control you need for a nice blended galaxy effect, and you'd probably waste a lot of paint in the process. At least a cheap airbrush is probably required here.