First layer of lines and face details.
Defining lines, darkening details, a bit more shading.
Filling in details and a lot more scribbling.
Final pencil render.
Fine tuned, cleaned up, and embellished in Photoshop CS6.
This piece was inspired by a lot of things - such as the Borg Queen and Elizabeth Lavenza's face after Victor mutilated her (Frankenstein, Helena Bonham Carter).
But it was primarily inspired by The Angel of Death from Guillermo's adaptation of Hellboy in the Golden Army. The creature below is described in The Book of Revelations in Chapter 4. Spooky stuff.