This example renders a stylized smiley face entirely with React and D3 v5, using SVG elements for all shapes. It constructs the face from circles for the head, eyes, and pupils, while using the `d3.arc` function to generate the mouth, lips, and eyebrows as path data. The face is centered via a group transform, and the code demonstrates how D3’s arc generator can produce both standard and custom angular spans, combining React’s declarative component structure with D3’s geometry utilities.