A smiley face—composed of a circular head, two eyes, and an arc mouth—is drawn using D3.js and React, with a horizontal black-to-white gradient on the face and an inverted gradient on its outline. The image is rendered as a static SVG element, using D3’s `d3.arc` to generate the mouth’s path, while eye and face circles are positioned with fixed pixel offsets. The example demonstrates how D3 geometry helpers integrate with React’s declarative component model for simple, parameterized vector graphics.