A smiling face is drawn in SVG with D3.js v6, featuring a yellow head, two eyes, and eyebrows, with the right eyebrow animating upward via a `transition()` over two seconds. The code builds the figure using `select`, `append`, and `arc` from the D3 library, positioning elements through SVG `transform` attributes and computing the mouth’s path from an arc generator with specified angles. The static parts render instantly, while the animated eyebrow demonstrates D3’s transition system on SVG attributes.