This example uses D3 v5 to draw a simple, cheerful face entirely with SVG shapes. It creates a yellow circle for the head, two smaller black circles for eyes, and a semi-circular path for a mouth, all positioned precisely within the SVG canvas. The code directly uses the D3 `select` API to append shapes to the SVG and the `d3.arc` function to generate the mouth's path data. The visualization demonstrates fundamental SVG drawing capabilities with D3.