The tragic story of Emmett Till is one of a face. The face of a 14-year-old boy, beaten and murdered in Mississippi, a battered and bloated face that his mother insisted be seen by the world. Chinonye Chukwu’s “Till” is a story of two faces: Emmett’s and that of his mother Mamie Till-Mobley, portrayed by Danielle Deadwyler in a powerfully skilled and undeniably star-making screen performance. In imagining a way to tell Emmett Till’s story without focusing on the violence and torture the boy suffered, Chukwu, along with co-writers Michael Reilly and Till investigator and filmmaker Keith Beaucha…