A yellow smiley face drawn in SVG uses React to render a circle head, two eyes, and an arc-based mouth. The code applies D3’s `arc` generator to create the mouth path, while manually positioning the facial features relative to a centered coordinate system. Stroke width and radius values are defined as constants, and a commented `d3.line` example suggests an alternative path approach that is not currently active. The visualization demonstrates mixing React components with D3 shape generators for declarative SVG composition.