You can spot a real smile by the way it crinkles up the eyes. A real smile is enjoyable for both the wearer and the recipient.
Fake smiles only happen around the mouth, and don’t really affect the eyes. But maybe it means more if someone is going to the effort of smiling for you, even if they don’t feel like it inside.
Or they could be a serial killer, who knows.
Interesting work Lunamatic! I have been enjoying your recent works and others since I joined Aviary. =)