From the blog "The Aksha'i Cruentes - A World Eaters Crusade Blog"

Took a month, but Arkrath is finally done!     Painting red Daemonic flesh when the model is also wearing red armour is always tricky, so I went with the option of painting the flesh like a redder version of his moral skin tone.      Of course, had to slather on the blood for the oversized chainfist!     I expanded on the rock that the Daemon Prince model comes with, making it feel more like the type of rocks the rest of the army uses.