" Lips up, loads of teeth showing = very amused, happy. Lips up, no teeth showing = slightly amused, pleased. Lips pressed together, slightly turned down = not amused, slightly cross, or else puzzled (hard to tell which). Lips pressed together, eyes scrunched up at the same time = very displeased, angry. Lips round like an O and eyes wide open = startled, surprised. "

― Siobhan Dowd , The London Eye Mystery (London Eye Mystery, #1)