A yellow circle with a black outline forms the face, featuring two solid black eyes and rectangular eyebrows. The eyebrows animate by moving downward and then returning to their original position over a sequence of transitions. The mouth is drawn using the D3 `arc` function to create a curved path. The visualization is built with React and D3 v4, rendering all shapes as SVG elements within a centered group, with animated transitions applied via `transition().duration()`.