Meaning: This sentence is about how smiles can brighten up a person's face and make them look radiant and happy.
Choice of Words: The words "smiles," "beam," "like," "sunshine," "on," "faces" create a vivid image of smiling faces that are as bright and warm as sunshine. "Smiles" refers to the expression on a person's face when they are happy or amused. "Beam" means to shine brightly. "Like" is used to compare the smiles to sunshine. "Sunshine" is the bright light of the sun. "On" indicates the position of the smiles on the faces. "Faces" refers to the front part of a person's head.