Hey, still looking forward to doing that Tervigon for ya
As for your Zoanthrope, it looks really good. The key to good highlighting is to gradually mix in the lighter colour as you highlight up. Extreme highlighting (Tentacle Pink on Warlock Purple, for example) is ok, but the effect can look cartoonish. If you gradually mix in the pink to the purple, apply the highlight, then mix more pink in, will add depth and look more realistic. As for blending, the whole key is liberal amounts of water in your paint that you apply to the model. I personally prefer highlighting over blending, but either can look very convincing and very good! 1
I would pick out some of the details on him, like teeth, maybe the chunks in the carapace, etc, but other than that, he's very well done