My question, as an aspiring children's book illustrator, is: when you receive a manuscript and get the go-ahead to publish it, are you the one who then searches for an appropriate illustrator with the help of an art director; or is the art director the sole decider of the story's illustrated destiny? (That was a little dramatic, I apologize)This varies from house to house. Some editors have a great deal of say in the illustrator selection, and pretty much every editor has some say in it. Designers have a voice in this, too, and depending on the editor, the author may even get some say in the decision.
So be nice to everybody. This is good advice generally, but especially so in children's books.