A smiling face drawn with D3.js appears as a yellow circle with black-outlined eyes, animated eyebrows, and a crescent mouth. The SVG-based visualization uses D3 selections to append shapes, including rect elements for eyebrows that transition vertically over two-second intervals. The mouth is rendered with d3.arc(), while circle positioning and transforms center the face within an SVG. D3 v6 powers the animation and shape construction in this React-free starter example.