As visitors flock to this year's blockbuster show, the National Gallery's Leonardo da Vinci: Painter at the Court of Milan , Guardian art critic Jonathan Jones takes a detailed look at some of the Renaissance master's most admired drawings – from grotesque caricatures to sublime nudes Click on the images for full information, zoom in for a detailed view and listen to Jonathan's audio analysis below. We will be running a Leonardo interactive every week until the exhibition ends in February 2012