Hey!
Segue meu job:
<canvas width="600" height="400"></canvas>
<script>
var tela = document.querySelector("canvas");
var pincel = tela.getContext('2d');
//Cabeça
pincel.fillStyle = 'darkgreen';
pincel.fillRect(125,50,350,300);
//Nariz
pincel.fillStyle = 'black';
pincel.fillRect(265,200,70,100);
//Boca
pincel.fillStyle = 'black';
pincel.fillRect(225,240,40,110);
pincel.fillStyle = 'black';
pincel.fillRect(335,240,40,110);
//olhos
pincel.fillStyle = 'black';
pincel.fillRect(175,110,90,90);
pincel.fillStyle = 'black';
pincel.fillRect(335,110,90,90);
</script>