A yellow circle with a black stroke forms the face of a smiley, positioned at the center of an SVG canvas. Two dark eyes sit above a curved mouth drawn as an arc path, created with `d3.arc` using specified inner and outer radii and angles. The React components `BackgroundCircle`, `Eyes`, and `Mouth` render the shapes, with all dimensions defined as constants. Coordinates are transformed to center the face, and the visualization is rendered entirely with SVG elements.