A face built from D3-selected SVG shapes sits on a green circle with a blue stroke, while two black circles serve as eyes of different sizes. A D3 arc path creates the start of the mouth, showing only the first part of a curve toward a smile. The page uses D3 v7 to append a group element and construct the arc with inner and outer radii, plus start and end angles in radians. Static values hardcoded in the markup define the face, matching the README’s note that it is only half finished.