A continuacipon dejo el código que desarrollé para esta práctica:
<style>
body { background-color: lightgrey; }
</style>
<canvas width="600" height="400"></canvas>
<script>
const d = document
const $canvas = d.querySelector("canvas")
const brush = $canvas.getContext("2d")
let canvasW = $canvas.getAttribute("width")
let canvasH = $canvas.getAttribute("height")
// brush.fillRect(x, y, width, height)
// ##### Canvas #####
brush.fillStyle = "white"
brush.fillRect(0, 0, canvasW, canvasH)
// ##### Head #####
brush.fillStyle = "darkgreen"
brush.fillRect(125, 50, 350, 300)
brush.fillStyle = "black"
// ##### Left eye #####
brush.fillRect(175, 100, 90, 90)
// ##### Right eye #####
brush.fillRect(335, 100, 90, 90)
// ##### Nose #####
brush.fillRect(265, 190, 70, 100)
// ##### Left moustache #####
brush.fillRect(225, 240, 40, 110)
// ##### Right moustache #####
brush.fillRect(335, 240, 40, 110)
</script>