<meta charset="utf-8">
<canvas width="600" height="400">
</canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
//cabeza
pincel.fillStyle = "green";
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, 100);
//boca
pincel.fillRect(300, 240, 40, 110);
pincel.fillRect(410, 240, 40, 110);
</script>
