A smiling face built with D3.js v5 uses SVG circles and a path to render its head, eyes, and mouth. The eyebrows are rectangles that animate up and down using chained `transition` calls with a two-second duration each. The visualization demonstrates core DOM manipulation by selecting an `svg` element and appending groups and shapes based on fixed pixel dimensions. The code imports `select` and `arc` from the D3 library to create the face and generate the mouth's curved path.