What makes a girl smile?
Make her laugh, compilent her tell her she has a beautiful smile (then she'll smile) say she has pretty eyes or just smile at her. Tell her you love her, only if you do its worst to tell someone you do and then when she finds out it's heart breakinggg!
But make sure everything you say you mean it treat her like a princess and just be yourself, if you don't act like yourself then she's not fancying you she's loving the boy who your trying to be,
hope this help<3