A stylized smiley face rendered in SVG using React and D3’s `arc` generator for the mouth, with two animated circles for eyes that pulse via `<animate>` elements. The face fills a dark grey circle with a black stroke, while the left eye is overlaid with a darkkhaki geometric pattern defined in SVG `<pattern>` and `<path>` elements. D3 v6 computes the mouth’s inner and outer arcs, and React handles the component structure and JSX state. The example uses fixed pixel dimensions and coordinates, with no external data source.