"the way he made it is make 1 screenshot of the head.
duplicate it and move each layer to a certain place, continue with the next one."
That's right ^
but I'm not a gimp user so i used Ulead GIF Animator.
ulead? hmm never heard of that one. i use unFREEz for GIF animating. make each frame in photoshop, save as gif. and move it in the box to animate it :3