<canvas width="600" height="400"> </canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
//cabeza
pincel.fillStyle = "darkgreen";
pincel.fillRect(0,0,350,300);
//ojos
pincel.fillStyle = "black";
pincel.fillRect(50,45,90,90);
pincel.fillStyle = "black";
pincel.fillRect(200,45,90,90);
//nariz
pincel.fillStyle = "black";
pincel.fillRect(130,130,70,100);
//parte de la boca
pincel.fillStyle = "black";
pincel.fillRect(200,190,40,110);
pincel.fillStyle = "black";
pincel.fillRect(90,190,40,110);
</script>