As I walk through the museum, I can tell which painting is based on a model and which is not - Caroline von Grone has a keen eye for situations and an unerring one for portraits. In 1991, she was a master-class student under Klaus Rinke at the D sseldorf Art Academy and, quite untypically for that time, had turned to painting portraits, either of models she had approached, for instance in subway stations, or later then of models who commissioned...