KERRY JAMES MARSHALL, “Past Times,” 1997 (acrylic and collage on unstretched canvas). | Estimate $8 million-$12 million. Sold for $21.1 million including fees ($18.5 million hammer price). RECORD   MARQUIS WORKS BY AFRICAN AMERICAN ARTISTS are increasingly showing up at major auction houses. The latest is “Past Times” by Kerry James Marshall, which is being...