The tabard of the model was so badly scraped, it needed major fine filing to get it smooth.  I have no idea if there was a design on it originally or not..  There are some weird little holes on the tabard that needed to be disguised, so a gold filigree pattern was designed around them and the Slaanesh symbol.

  The stars on the robe were a last minute idea.  I had the robe going from red to blue, but not much else.  So I thought a star filled sky would look neat, especially versus the intricate filigree on the tabard.  The big nova-like star on his shoulders is a star burst version of the eight pointed chaos star

  The base was sculpted to be eerie faces, mouths and other orifices. Pushing him up as he summons his power.