I've fleshed out the bone color, as well as a few other details. First and foremost, I decided I wanted a large soulstone on the face-plate, so I made one real quick out of green stuff. Also, I liked the pinkish fade they included on the box art for the Wraithlord's sword. It was for a Saim-Hann Wraithlord and it gave the blade a kind of ethereal feel to it, like it was alive ... and that's exactly what I wanted to do (without the pink, of course).
Only things left to do are the cape-tabards and to slap some runes on him and call it a day.