Aqui mi intento.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Cara de Minecraft</title>
</head>
<body>
<h1>Cara de Minecraft</h1>
<canvas style="margin-left: 50px;" width="350" height="300"></canvas>
</body>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
//fondo
pincel.fillStyle = "green";
pincel.fillRect(0,0,350,300);
//ojo izquierdo
pincel.fillStyle = "black";
pincel.beginPath();
pincel.moveTo(50,50);
pincel.lineTo(140,50);
pincel.lineTo(140,140);
pincel.lineTo(50,140);
pincel.fill();
//ojo derecho
pincel.fillStyle = "black";
pincel.beginPath();
pincel.moveTo(210,50);
pincel.lineTo(210,140);
pincel.lineTo(300,140);
pincel.lineTo(300,50);
pincel.fill();
//nariz
pincel.fillStyle = "black";
pincel.beginPath();
pincel.moveTo(140,140);
pincel.lineTo(140,240);
pincel.lineTo(210,240);
pincel.lineTo(210,140);
pincel.fill();
//boca izp
pincel.fillStyle = "black";
pincel.beginPath();
pincel.moveTo(90,190);
pincel.lineTo(90,350);
pincel.lineTo(140,350);
pincel.lineTo(140,190);
pincel.fill();
//boca der
pincel.fillStyle = "black";
pincel.beginPath();
pincel.moveTo(210,190);
pincel.lineTo(210,350);
pincel.lineTo(260,350);
pincel.lineTo(260,190);
pincel.fill();
</script>
</html>