The unlikely tale of Margaret and Walter Keane created one of the most interesting stirs in the history of contemporary art, and director Tim Burton does a fine job dramatizing their lives. It has been decades since the Keanes made a splash in the art world, so many viewers will come to their story fresh, but that does nothing to diminish the film. “Big Eyes” is loaded with universally accessible themes, including commentaries on narcissism, the power of mass production and the problems with a patriarchal society.