Your words have value. What you say to someone holds weight for them. You can change a person's entire day with just a few uplifting words.
If you have something nice to say, say it. Interrupt a conversation to tell someone that their hair looks beautiful. Stop someone walking by to tell them that you like their style. Send your friend a text to let them know that you appreciate their cheerfulness or their thoughtfulness or graciousness. Tell your mother that her wrinkles are beautiful. Let your child know that their artwork is the the most amazing thing you've seen.
Don't hesitate. That person needs to hear your words. Go ahead: make their day.
By the way, you have a beautiful smile! 😄