This example uses React to render a smiling face as an SVG composed of D3-generated arcs and primitive shapes. It defines a yellow background circle, black eyes, white pupils, pink blush ellipses, and a mouth path created with `d3.arc` using specified inner and outer radii and angles. The code positions elements relative to the center using offsets, with the `arc()` API generating the curved mouth geometry. All shapes are hardcoded with fixed dimensions and coordinates, not driven by external data.