I had the same thought as Seth. My suggestion is to darken the areas between the skin and open wounds, really bring out a starker contrast, or that there would be blood (or something!) oozing out. I'm also thinking the skin color needs to be more complex, maybe even simply a brown wash. Fingernails too. Nurgle stuff is difficult to strike an equally appealing and disgusting tone. You're definitely on the right track, and very nearly finished.