Meu modelo Creeper

O meu modelo ficou dessa forma, o que acham?

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

<script>

    var tela = document.querySelector('canvas');
    var pincel = tela.getContext('2d');


    pincel.fillStyle = 'lightgrey';
    pincel.fillRect(0,0,600,400);

    pincel.fillStyle = 'darkgreen';
    pincel.fillRect(100,50,350,300);

    pincel.fillStyle = 'black';
    pincel.beginPath();
    pincel.fillRect(130,100,90,90);

    pincel.fillStyle = 'black';
    pincel.beginPath();
    pincel.fillRect(320,100,90,90);

    pincel.fillStyle = 'black';
    pincel.beginPath();
    pincel.fillRect(230, 170, 70, 100);


    pincel.fillStyle = 'black';
    pincel.beginPath();
    pincel.fillRect(200,250,40,100);

    pincel.fillStyle = 'black';
    pincel.beginPath();
    pincel.fillRect(300,250,40,100);





</script>