A smile shows invitation and is usually underused by leaders. It shows you are a friendly person, and people can easily approach and talk to you; it's welcoming and can help you connect with your team!
Check out this interesting video about the major benefits of smiling more often:
Carol Kinsey Goman, “5 Ways Body Language Impacts Leadership Results” on forbes.com, 2018
Photo by Rebrand Cities from Pexels