I meant to do this ages ago, but I'm lazy, what can you do. Some of this is based on the artbook/storyboards/script and that one comic which I'll scan someday because Jack sparkles in it. To be edited whenever.
The general appearance of Pitch went through several drastic incarnations. Production designer Patrick Hanenberger recalls one version that depicted him as a truly hard-core, almost medieval villain, complete with long fingernails, Goth-like features, and a metal mask. In other sketches, he was more of a normal human being. The designer even toyed with the idea of Pitch and Jack being brothers. Finally, thanks to evocative illustrations by James Baxter and scultupre by Hyun Huh, they came up with a design that was both simple and elegant.