The tentacle on the back of his head is okay, but may I suggest trying to find a way for that part to be optional, maybe like Valkyr's bonds? I've never been a huge fan of Ash's bandana/ponytail look, such as with his Koga skin or the primed variant.

The tentacle is definitely a welcome feature - it looks very cool, but it may not work for everyone, so maybe just make it an optional part of the helmet? It's just a suggestion.

Other than that, I would give this skin a 9/10. The detail is pretty sweet and it definately has a huge mutalist vibe without deviating too far from Ash's general appearance. The torso has much more substance than some of his other skins, and I was more than satisfied with the Nikana Ungulata skin you released, so I'm looking forward to the release of this new skin.