Visitors look at a painting by Wu Hufan estimated at a price of 8 million to 12 million HKD (about 1 million to 1.5 million U.S. dollars) during the preview of the Hong Kong 2013 Spring Auctions held by China Guardian Auctions Co.Ltd in Hong Kong, south China, April 3, 2013. The two-day auctions will start on April 4, with over 300 pieces of paintings and calligraphy as well as ceramic artworks. (Xinhua/Li Peng)