A cheerful yellow face built from SVG shapes demonstrates the basics of D3.js v7. The code uses d3.select to append circles for eyes and an arc-generated path for the mouth, with the face centered via an SVG transform. Eyebrow rectangles animate through d3.transition, moving up and down over two-second intervals. The example relies on d3.arc and d3.select, rendering in SVG with a yellow background circle.