With the brush paint a white unicorn shaped head on the cheek and fill in.

Create the rainbow swirls by painting on the silver, sparkle lilac, sparkle blue, pale green and pale yellow. Also paint a flowing mane on the unicorn in fuschia pink. Lastly add a sparkle blue eye.

With black, outline the unicorn, paint around the eye adding eyelashes, and add some black swirls to your rainbow. Lastly with white add some dots and star bursts and a small dot in the eye.