As a monster of the deep sea he has ~~shiny~~ clean, inorganic chains which doesn't make THAT much sense. The chains make sense with his other 3 skins being metal like his sexy legs and such. The sound is also made to sound like real chains retracting. However, could you dirty up the chains a bit? Even just a bit of rust is enough, they don't have to have algea on them or something fancy like that. Saying that, I haven't seen the execute screen the to-be-minced enemy sees yet, maybe it's there, just too subtle.
It's just aestetics but would a nice touch nontheless.