Margaret's paintings of doe-eyed children gained fame when her husband, Walter Keane, took credit for her work in the 1950s and '60s. After years of silence, Margaret slapped Walter with a slander suit in 1970 that went to trial. During the hearing, Margaret challenged Walter to a paint-off to prove who was truly behind the paintings. She won $4 million in damages.
"Ultimately we're telling [Margaret's] story and she's a very special woman," Amy told ET.
While the movie strongly depicts Margaret's strength, her reserved demeanor led some to underestimate her.
"I think people sometimes mistake being quiet for being weak," Amy said. "She's not a weak woman. She got caught up in something and allowed herself to be manipulated and she would say that she was naive."
Her character may have been naïve, but Amy proved to be hyper aware in our Name the Celebrity Big Eyes quiz. Watch the video to see how she did!
Big Eyes, directed by Tim Burton and co-starring Christoph Waltz, Krysten Ritter and Jason Schwartzman, opens Christmas Day.