A cheerful cartoon face appears as a yellow circle with black outline, two black eyes, and white pupils that shift side to side before settling. The mouth is drawn as an arc path using the d3 `arc()` helper with specified inner and outer radii. Built with d3 v5, the visualization renders entirely in SVG and uses chained `transition().duration()` calls to animate the pupils horizontally across each eye. The code selects elements with d3’s `select`, appends shapes with `attr`, and relies on the `arc` generator to create the curved smile.