<meta charset="utf-8">
<canvas width="600" height="400"> </canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "lightgrey"
pincel.fillRect(0,0,600,400);
pincel.fillStyle = "darkgreen"
pincel.fillRect(125,50,350,300);//cabeza
pincel.fillStyle = "black"
pincel.fillRect(175,110,90,90);//ojo 1
pincel.fillRect(335,110,90,90);//ojo 2
pincel.fillRect(265,200,70,100);//nariz
pincel.fillRect(225,240,40,110);//boca 1
pincel.fillRect(335,240,40,110);//boca 2
</script>