Hola, esta activad me gusto ya que soy fan de Minecraft, les comparto mi codigo
<meta charset="utf-8">
<canvas width="600" height="400">
</canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
//cabeza
pincel.fillStyle = 'darkgreen';
pincel.fillRect(200, 50, 350 ,300);
//ojos
pincel.fillStyle = "black";
pincel.fillRect(250,100,90,90);
pincel.fillRect(410,100,90,90);
//nariz
pincel.fillRect(340,190,70,100);
//bigotes
pincel.fillRect(300,240,40,110);
pincel.fillRect(410,240,40,110);
</script>
