A "welcoming smile" refers to a friendly expression or gesture on someone's face that makes others feel accepted, comfortable, and happy to be in their presence. Full definition
The incredible scenery, food, and the warm welcoming smiles of the people. (adventureinyou.com)
Don't let these churches with their big welcoming smiles and their open arms use this once - revered organization as a tool to further their own ends! (religion.blogs.cnn.com)
At a recent training session I conducted, fewer than half of the participants were able to identify their own welcoming smile. (sciencemag.org)