So I suck at facial expressions. I can't really smile on command (I have to be laughing), my eyebrows are inflexible, and I have resting bitch face pretty hard. To quote a homeless man I walked by 30 minutes ago "life's too short to have a face like that". Body language and facial language specifically is a huge part of game, so how can I improve this? Are there exercises I can practice in the mirror? Any insight would be great.