<canvas width="600" height="400"></canvas>
<script type="text/javascript">
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
/*
pincel.fillStyle = "lightgray";
pincel.fillRect(0,0,600,400);
*/
pincel.fillStyle = "darkgreen"; //rostro
pincel.fillRect(115,45,350,300);
pincel.fillStyle = "black"; //ojo 1
pincel.fillRect(160,100,90,90);
pincel.fillStyle = "black"; //ojo 2
pincel.fillRect(320,100,90,90);
pincel.fillStyle = "black"; //nariz
pincel.fillRect(250,190,70,100);
pincel.fillStyle = "black"; //boca 1
pincel.fillRect(210,235,40,110);
pincel.fillStyle = "black"; //boca 2
pincel.fillRect(320,235,40,110);
</script>