At a movie screening for a Disney film, the coordinators wore mouse ears that had flashing lights. The lights lit up in a circle creating a visual effect of spinning light. Anyway, I had to make a dot painting based on what I saw.
Naturally I started with a dark neutral background. I mixed white with a little purple to imitate the light I saw. Then I started with a circle and varied the brightness of my dots. From there, I painted outward and inward from the circle. Of course I put my own artistic spin on my image.