Have you considered using water effects of any kind? I've seen some very realistic looking slime coats done for Nurgle effects, especially on the abdomen region. Having small wounds oozing puss would also look good.
As an hq, you may want to consider having a few collected heads and helmets from other armies kept at his belt.
Otherwise, the progress is looking very good.;Y
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It's not a choice, it's a Nurgling.
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