This example renders a smiling face in SVG using React for the component structure and D3.js for the arc path that forms the mouth. The face includes circles for eyes and ears, with angled lines for eyebrows, all positioned via SVG transformations. The code uses React's `ReactDOM.render` to mount the component and D3's `arc()` generator to compute the mouth's curved path. All shapes are drawn declaratively with fixed dimensions and coordinates, producing a static illustration with no interactive behavior.