Grim Defeat by @alhena (Alhena)

This is another picture inspired by a scene from the HP books. It's from PoA, from the chapter "Grim Defeat", during the Quidditch match in the rain, where Harry thinks he sees the 'Grim' again. I sketched a few versions of the dog during a boring class. One just looked strange, one looked too friendly, one looked like a cat, and one finally seemed to fit, which is the one you can see here. It was really hard to get the atmosphere right. I'm not really sure I managed it. It was also hard to draw because I had no reference (where would you find a picture like that?), so I'd appreciate any comments, positive or negative.