"One of the most important works that we've been sent in is from an Honorary Royal Academician, Jasper Johns – one of the world's greatest artists – who has generously sent us a new drawing straight from his studio. It's from a wonderful series called 'Regrets' which are based on a photograph of Lucian Freud. They're folded and unfolded, and within Jasper's exploration of the image, when opened out, he unexpectedly discovered a skull. It's so striking. Jasper is in his late 80s and so it seems like such a touching work."