In her recent exhibition “Stone Flesh,” the Shanghai-based painter Hu Zi, widely recognized for her focus on portraiture, presented a quirky collision of mythologies with new oil paintings and sepia-toned gouaches based on Michelangelo’s David, 1501–1504; Bartolomeo Ammannati’s Fountain of Neptune, 1565–74; and other Renaissance sculptures, interspersed with and punctuated by paintings of David Gilmour, the British rock star and former lead guitarist of Pink Floyd. Known also for her roster of celebrity portraits—stand-ins for the artist herself by way of, say, Johnny Depp’s Edward Scissorhands