A smiling face built from modular React components renders as SVG, with a yellow background circle, two black eyes, and an arc-shaped mouth. The example demonstrates how to compose reusable SVG elements using React props for geometry like radius, offsets, and stroke width. D3’s `arc` generator creates the mouth path, while a `FaceContainer` wraps the SVG group and applies centering transforms. The face is drawn at fixed dimensions (960 by 500) with no data source, focusing on declarative component structure and D3 integration within a React framework.