Before beginning transition, although I was a very positive person, I really didn't smile that much. In fact, people often asked me "what's the matter?" even when I was just doing a neutral expression.
But ever since starting transition... oh heck yes!!! I NEVER stop smiling. Because for the first time ever, my smile is actually starting to look cute again, and not just like a stupid fake "guy smile." And having the right hormones in my head is making me SO much happier! Anything amusing gets me giggling like a little school girl, and whenever I make videos of myself I always end up laughing at least once or twice while I'm just talking to the camera. And a couple of days ago, one of my coworkers even said that she remembered me specifically because I was always smiling.
Feels great! One of my new goals in life is to help fill the world with smiles.