Fatemaster and Curseling

Hi guys - small update today; I was originally convinced that I should have a Curseling as my Tzeentchian warband leader, but during the last few days I got an idea that I had to try out - a Fatemaster on Disc conversion, based on the Stormcast on Dracoth leaders torso and a couple of Retributor legs.

I'm kinda torn between these two - which is the coolest, what should I use? They're obviously more like sketches at the moment, the Fatemaster needs some more Tzeentchian detailing, and the curselings helmet is giving me a bit of grief - I'm not sure what bit to use - but I'd still like your opinions.

Update on the Curseling: