I think this is my favorite. You have a way with drawing "creepy" looking teeth and the motion she makes in my head between the two "frames" makes her feel really unsettling to me, like I imagine her peeking over the edge of the bed when I wake up. I like creepy, thus I like this picture because it speaks to some primal little fear in me.
That said I really like all your art of Grauline. :D