<canvas width="600" height="400"> </canvas>
<script>
var pantalla = document.querySelector ("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "darkgreen"; //cabeza
pincel.fillRect(100,100,350,300);
pincel.fillStyle = "black";//ojo
pincel.fillRect(145,145,90,90);
pincel.fillRect(305,145,90,90);
//nariz
pincel.fillRect(235,235,70,100);
//boca
pincel.fillRect(305,290,40,110);
pincel.fillRect(205,290,40,110);
</script>