I just finished this theatre poster for Theatre by the Bay. It's for their Cinderella play that's for kids. I really have fun doing these posters. Here's my process:
They wanted the Fairy Godmother to be a bit smaller, she seemed to be dominating the poster. The wicked step sisters were too scary looking so I had to change them. Also they preferred that Cinderella's hair was up in a bun.
Before moving onto the inks, they wanted the bottom of Cinderella's dress to have a flower pattern.