No, these aren’t “art films” in the old manner of semi-nude Swedish imports, like I Am Curious (Yellow). Instead, tonight’s Showtime double feature is a show all about art. Big Eyes, at 8 p.m. ET, stars Amy Adams (pictured) in a 2014 biography of Margaret Keane, the actual artist of the paintings credited to her husband. Then, at 10 p.m. ET, Helen Mirren stars in 2015’s Woman in Gold, about a woman battling to reclaim artwork seized years ago by the Nazis.