Agent Nathan wrote something interesting in his blog yesterday: "descriptions of facial expressions really only thinly veiled ways of telling the reader what emotion the character is feeling. Unique gestures, dialogue and actions tend to be much more interesting ways of describing the way someone is feeling and go further toward creating interesting characters. Emotions and facial expressions are universal -- how people deal with emotions and express those emotions are unique."
To be honest, I'm pretty happy if authors submitting to Electric Spec do describe facial expressions, rather than actually telling, e.g. "The Elf Queen was sad." But Agent Nathan is correct--this is only one step removed from telling.
Good writers are constantly learning and improving their work. Can you convey emotion without telling and without facial expressions? Show us your unique characters and their emotions!