Suzannah Mirghani ’s Sudanese drama “Cotton Queen” won the top prize Sunday at the Thessaloniki Film Festival , taking home the Golden Alexander for best feature film. Mirghani’s arresting debut — the first-ever feature film shot by a female Sudanese director — wowed the festival jury, which included Match Factory head of sales Τhania Dimitrakopoulou, U.S. cinematographer Frederick Elmes (“Blue Velvet,” “Wild at Heart”) and writer-director Elegance Bratton (“The Inspection”), who said “Cotton