The figure is back. Faces stare, bodies sprawl, fingers swipe, mums clutch, hands loll. The Venice Biennale was full of it. After decades of being pushed to the margins, figurative painting is once again dominating the art world. Peter Doig, Alex Katz, Chris Ofili and Jenny Saville head the sales at auction houses, but there is a whole market of up-and-comers snapping at the heels of these established names.