A smiling face rendered as a yellow circle with black outlines, featuring two eyes and a curved mouth, is drawn using SVG within a React application. The composite `Face` component assembles `BackgroundCircle`, `Eyes`, and `Mouth` elements inside a translated group. The mouth is generated with the D3 `arc` function, while the position and sizes of features are parameterized through props. The final SVG is mounted into the DOM using ReactDOM.