A cartoon face is drawn entirely with SVG shapes, using a yellow circle for the head, black circles for eyes, and a curved path for the mouth created with the D3 `arc` generator. The code uses D3 v7 selections to append elements to an SVG canvas, with explicit attribute setters like `.attr('cx', ...)` and `.attr('d', ...)` to position the eyes and compute the mouth's arc geometry. Elements are grouped in a `<g>` element translated to the canvas center.