Bathed in pink, Jacob Epstein's Lucifer looks disdainfully down on the crowd at this week's "Carnival of Cute" at Birmingham Museum and Art Gallery. There is no version of hell he could have imagined which could be worse than this... "Too Cute! Sweet is about to get Sinister" is a fantastic show, curated by an artist I've been watching for some time, Rachel Maclean, probably best known for her…