 
  
<canvas width="600" height="600"></canvas>
<canvas name = "boca" width="600" height="400"></canvas>
<script>
    var pantalla = document.querySelector("canvas");
    var pincel = pantalla.getContext("2d");
    // Definimos cabeza
    pincel.fillStyle = "green";
    pincel.fillRect(0,0,350,300);
    //Ojo 1
    pincel.fillStyle = "black";
    pincel.fillRect(50,40,90,90);
    //Ojo 2
    pincel.fillStyle = "black";
    pincel.fillRect(205,40,90,90);
    //Nariz
    pincel.fillStyle = "black";
    pincel.fillRect(136,129,70,100);
    //boca 1
    pincel.fillStyle = "black";
    pincel.fillRect(97,188,40,110);
    //boca 1
    pincel.fillStyle = "black";
    pincel.fillRect(206,188,40,110);
</script> 
            