Spoiler warning: Resurreccion form.
Micron inks, pencil shading and color for the eyes, I hate my scanner!
Deviantart link again because the fullsize image is huge (click download).
Picture is based on my impressions from seeing Ulquiorra's three forms the first time and impressions based on the evolution of his character.
I do have another experimental painting WIP but I can't guarantee I will get it done.
*raises palm* I solemnly swear, I will try my hardest NOT to Rule34 this.