I really like it very nice, while your others weren't bad the black looks more detailed now with the grey highlights and the addition of golds and metallics as spot colours makes the model much more interesting, have to say I'm jealous!!
Possibly just to add a bit more detail for the parchment and such which aren't on the body (in particular the one at the base of the main blade on the staff) try actually painting that as a bit of parchement with scripture on it? As I can imagine being less brunt (as obviously burnt parchment will just turn to dust!)
Me: To be honest im amazed there isn't a chaos god of not revising or at least chaos god of procrastination
MidnightSun: There will be, when enough people do it. Y'know when the Eldar were all engaging in their hedonism and Slaanesh ripped open the Eye of Terror with his creation? Slaanesh will have NOTHING on the God of Procrastination, and his vile minions will carve the galaxy asunder in a thousand year reign of blood.... Tomorrow