A vector smiley face is rendered as a yellow circle with a black outline, two eyes, and a curved mouth, all built from composable React components. The Face component assembles a FaceContainer SVG, a BackgroundCircle, Eyes, and Mouth. The mouth uses the D3 arc generator to create a semicircular path, while the overall composition is placed using a translate transform. The example demonstrates a modular approach to constructing SVG graphics with React and D3.