My thoughts exactly, on the skin. These guys aren't daemons but have spent enough time in the warp to be changed by it.Looking good so far. For the red axe I would recommend watching the "How to paint Archaon" video. His sword, cloak and the creatures tail all have a nice reddish glow, although they may be a bit orangey, but you could dial that back a bit easily enough.
Any thoughts on the skin tone yet? I think a pale unhealthy colour would look really good.
As for the video, I'll have to check it out, thanks! I've already sprayed them white and then a cool red color, but hopefully the video can guide me where to go next.