By Jamie Roberts & Harry Rutter Elon Musk showed “regret” and a “wince of pain” after losing more than half of his entire net worth, claims a leading body language expert. The Mirror published pictures of the X, formally Twitter, owner stepping out after news his multi-billion-pound fortune had more than halved in just over a year. He looked downcast, but now we’ve learnt more about how the entrepreneur was really feeling. Judi James analysed the photographs, providing her expert opinions on Tesla CEO Musk’s mood as he left a hotel in Los Angeles on Friday. “Elon Musk looks uncharacteristicall…