Grievous, born as Qymaen jai Sheelal, was the cyborg Supreme Commander of the Droid Army of the Confederacy of Independent Systems for most of the Clone Wars. Grievous was originally a Kaleesh from the planet Kalee, where he lived his early life.
Just Vader's helmet, you say? This completely embodies the inner struggle of good v. evil (Light v. Dark Side) Anakin constantly has to live with, being the Chosen One. The high contrast photo is a metaphorically brilliant idea!