Short back and sides? There’s nothing so conventional on offer in the Hepworth Wakefield’s new exhibition, Salon Paintings. The haircuts listed on a chalkboard in one of Hurvin Anderson’s pictures of imaginary barbershops sound like spoken-word poetry: high top, flat top, skiffle, fade. But who is that man with a shaved skull, reflected in a colossal mirror, staring enigmatically at the viewer?