hanghai ShanghART: Zhang Ding: Vortex - closes Fri, 27 Oct ShanghART: Shi Yong: Under the Rule - closes Fri, 27 Oct Sydney Roslyn Oxley9 Gallery: Del Kathryn Barton: soft river yr girl new works on paper - closes Sat, 28 Oct twenty-two dazzling portraits that provide an intimate window into the artist's person