This example renders a yellow smiley face with black-outlined circular features using React and SVG. The face, eyes, and mouth are drawn with basic shapes: two `circle` elements for the eyes and a `path` generated by the `d3.arc()` API for the mouth. The D3 arc’s inner and outer radii, along with start and end angles, define a half-circle smile. The layout uses fixed coordinates for positioning within an SVG canvas, demonstrating a simple composition of geometric primitives.