Lo que hicimos en el aula

CREEPER

<canvas width="600" height="400"> </canvas>

<script>
    var pantalla = document.querySelector("canvas");
    var pincel = pantalla.getContext("2d");

    pincel.fillStyle = 'darkgreen'; //cabeza
    pincel.fillRect(200,50,350,300);

    pincel.fillStyle = 'black'; //ojos
    pincel.fillRect(250,110,90,90);
    pincel.fillRect(410,110,90,90);

    pincel.fillStyle = 'black'; //nariz
    pincel.fillRect(340,200,70,100); //

    pincel.fillStyle = 'black'; //boca
    pincel.fillRect(300,240,40,110);
    pincel.fillRect(410,240,40,110);

</script>

ESCUADRA

<canvas width="600" height="400"> </canvas>

<script>

    var pantalla = document.querySelector("canvas");
    var pincel = pantalla.getContext("2d");

    pincel.fillStyle= "gray";
    pincel.beginPath();
    pincel.moveTo(50, 50);
    pincel.lineTo(50,400);
    pincel.lineTo(400,400);
    pincel.fill();

    pincel.fillStyle= "lightpink";
    pincel.beginPath();
    pincel.moveTo(100, 175);
    pincel.lineTo(100,350);
    pincel.lineTo(275,350);
    pincel.fill();

</script>