This example constructs a simple cartoon face using D3.js v5 in an SVG-based React setup. It shows a yellow circle for the head, positioned at the center of a 960x500 SVG, with two smaller black circles for eyes offset horizontally and vertically. The code uses D3 selections and the `append` method with `attr` chaining to set geometric properties like `cx`, `cy`, and `r`. All shapes are rendered as static SVG elements without interaction or data binding.