The Evolution of Chaos God's Imagery

Khorne, Tzeentch, Nurgle, Slaanesh, and The Horned Rat.

I've gathered the official artworks for easy viewing.

Personally, I think Tzeentch looks more fitting in Total War art than in AoS art, so I prefer image #10.

Slaanesh also looks more like the Lord of Pleasure when depicted in a suffering state.