Depth
This one here is okay and has some serious depth going on inside it. I mean, the way the black lines flow with one another is fascinating. I love this style you do because it looks like rain of black making shapes and characters. I do think you use a bit too much black and could use some color on the main characters, but then it may lose that style you've got going on here, so while it may work out to add some color, I would understand if you did not do this.
~~THINGS TO IMPROVE ON~~
Good job as it is, but maybe add color to his one next time
~X~