Today 9-year-old Kieron Williamson opened his first retrospective exhibition at Picturecraft Gallery in Holt, Norfolk. It may seem insane to hold a retrospective of a schoolboy's four-year art career; but, as you might expect, his work has developed considerably since he was 5 years old. CLICK for a BBC slide show. Above is one of his latest oil paintings: Cley Mill from the Marshes (2012). David Keller of BBC Norfolk went to meet the Mini Monet: CLICK.