I mean...there’s clearly something off about those pages (the notebook, duh.)
I feel like the snake language is mostly something that needs knowledge of the other ones (specially the harpy) to be used properly...the only parallels sensei was able to make was through old werewolf signs.
I can't really put my finger on it but something about the style has changed. I think it has mostly to do with line thickness. But something particularly about the way Susuki's eyes are drawn freak me out in the later chapters.