Alright well you might want to remove the chaos symbols on his armor. The Night Lords aren't actually chaos, they use it as a meat shield. They actually dislike Chaos as a whole. They are renegade legion more than they are a Chaos Legion.
You're welcome and I forgot about this. The Night Lords have lightning bolts painted on their armor. Amd their helmets is painted to wear it looks like a skull. I'm not sure if they still do the Skull paint but if they do it should help.