I haven't worked up the courage to paint it yet, but I love this sculpt too - for CoC, it's a good proxy for a shoggoth, and for D&D, it's a particularly large and nasty gibbering mouther.
Yours is pretty good, the colour scheme more towards mouther than shoggoth. There is some lack of precision here and there, but with staggering amount of (repititive) detail on the sculpt, I can imagine that painting it is a daunting task!
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