I knew it when I was five and I know it now: Ezra Jack Keats is amazing.
Some of the Coraline concept art reminded me of Keats' The Snowy Day, particularly Chris Appelhans' great work. Appelhans will be at Reverie, Concepart.org's workshop, in Dallas at the end of the month - I'm looking forward to singing his praises in person and asking him if Keats was an influence.