First, the RAWR!
I did a bit more sword work, finished gluing him together, and now he needs wings. I'm still really not at all sure where I'm going with those :( And he's still missing shoulder pads. I'm contemplating leaving them off and/or making it look like they fell off his shoulders (from rot) onto the base.
Now onto the color issues. I like the fleshy armour, but I can't get over how incredibly not Nurgle it all looks. I'm planning on going back over the red areas with some kind of dead flesh. A pale white, maybe with a tinge of green, to try to make it look more like rot and less like bright red doom. I need a different trim color too. That green is just...bad. Overall I'm incredibly un-happy with the colors so far. My big problem is I can't figure out where to go and I keep putting it off in favor of converting new models.
I might end up painting a few tester Plague Marines, or maybe even more converted raptors that aren't so heavily converted. This guy doesn't have much left in the way of power armour that isn't deformed in some way and I think it's throwing me off.