epa05863452 A gallery employee stands next to a painting entitled 'Girl in Bed' by British artist Howard Hodgkin during the press preview of the exhibition 'Absent Friends' at the National Portrait Gallery in London, Britain, 22 March 2017. The exhibition dedicated to Hodgkin (1932-2017) opens to the public from 23 March to 18 June. EPA/FACUNDO ARRIZABALAGA