This example renders a stylized half-completed smiley face as an SVG using React and D3 v7. It draws a yellow circular head with white and black eyes, gray elliptical features, a pink tongue, and two arc-based mouth paths created with the `d3.arc()` API. The face is centered via a group transform, with shapes positioned using hardcoded coordinates and defined constants for offsets and radii. The code uses React components to structure the SVG elements, while D3’s `arc` function generates the mouth path data.