A smiling face is drawn as a full-screen SVG, with a yellow circle for the head, white stroke outline, two eyes positioned symmetrically, and an arc-based mouth. The visualization uses React to render the SVG elements and D3’s `arc` generator to construct the mouth path. Window dimensions set the circle’s radius, while fixed offsets control eye placement. The code applies React 16.9 and D3 v7, with the SVG centered via a `transform` translation.