Well, since his armour is gold, I figured that it'll be a model of him somewhere near the time when he first became sworn in by Nurgle. As such, his wounds and scabs aren't at their most infected yet, but aren't actually clotted yet either. As such, he's bleeding profusely out of every oriface in his armour. In terms of contrast, I really wanted to focus on the white of the face, since despite all the blood and guts coming from him, what's really the most intimidating is his face.