It looks good, but I would echo what's above. The green looks a little flat, and maybe even a little too bright for Papa Nurgle. If you want a quick fix, I would maybe just hit it with some Agrax, making sure it sinks into the edges/recessed detail.
Also you should paint the eye-growths on the front. It gives that model a ton of character
I love-love-love the blue-bloodied Tau helmet. Excellent touch.