<canvas width="600" height="400"></canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
//cabeza
pincel.fillStyle = 'darkgreen';
pincel.fillRect(200, 50, 350 ,300);
//ojos
pincel.fillStyle = 'black';
pincel.fillRect(250, 110, 90, 90);
pincel.fillRect(410, 110, 90, 90);
//nariz
pincel.fillRect(340, 200, 70, 70);
pincel.fillRect(300, 230, 150, 60);
pincel.fillRect(300,260,50,90);
pincel.fillRect(400,260,50,90);
</script>