His face is awesome. I like the ludovico technique headgear thing he's wearing to show his gritting teeth and gums. It really helps emphasize how unhinged he is.
Also, you've picked up a form of shading! Yaaay!!! I think your cross-hatching is pretty good for a first try, especially on the face and clothes. The way the lines rap around the shapes (almost like a wireframe) add to their form and give them depth. I understand this particular method is time consuming, but it'd be cool to see it more if you do more of these black and white drawings in the future.
Good job, dude.