A smiling face rendered in SVG displays layered radial and linear gradients, giving the face a polished, three-dimensional appearance. The example combines React with D3’s `arc` generator to construct the mouth’s shape, while static SVG elements—circles, ellipses, and `path`—define the eyes and face. Colors such as yellows, oranges, and browns create depth. The code uses React’s `ReactDOM.render` and D3 v5’s `arc` API to compose the visualization declaratively.