its so easy -use the paint roller tool -start with any color (i recommend starting with a blue of sorts) -draw a star with ur base color -continue to layer stars of different colors -find an are you like and zoom in on it using the zoom tool -move it around till you have ur desired art piece and you're done!^^

see, EASYYYY

OH I DIDNT MENTION!!! USE THE BIGGEST SIZE OF BRUSH!

hehehe idk how i came up with it..