What I want to say with the drawing is not to just take a smile for a smile. There is always a lot of other things behind a smile as well. See the whole person, take a moment to listen because all people are complex at their core and try to spread a little thoughtfulness.
Personally, I've learned to carry a mantra of optimism in the back of my mind the last few years (thank you therapy for that). It doesn't mean I always succeed but I try to stay positive even when hope feels lacking and the pain of living is at its worst.