Lay a lilac gradient background color.  
 Ultramarine + red + white outline first.  
Add more white to light gray purple.  
Deepen the dark part of the cloud.  
 Rose red + white outlines the bright part of the cloud.  
Medium yellow + white to highlight highlights.

White, medium yellow, pink, light blue, lake blue.
-> next : White, sky blue, lake blue, Puland, black, use a sponge to make a star