There is only one scene with full frontal nudity. It's in the latter half of the movie when one of the older girls (Bérangère Haubruge, 13) is sitting in a metal tub in the bathroom. She gets out, looking at her reflection in the mirror and as she stands you get a fleeting glance of her completely nude.
Sybilla fell in love with older Alexander, 40-year old widower but the man didn't return her feelings. One night she sneaked to a room where Alexander slept. She took her nighty off and lay down next to him, confessed she loved him.