Not this.
What the hell are you talking about? Its not a style change he literally forgets what characters are suppose to look like hence why you have moments where a character would have a cartoony expression when its suppose to be serious or why Leerio has gone through several revisions throughout the course of the manga because he couldn't get his character design down. Its the reason why people were laughing at Meruem's design originally because it looked exactly like Cell.
The Zodiacs have the worst designs in the manga, the new characters also don't have anything particularly notable about them that make them stand out from since they're literally background characters. Kurapika is the only character that has remained consistent throughout the manga.
It's counter-productive, you chose a panel where he can't even drawing, if that isn't a good drawing so the actual chapters are goods

Just don't answer my question instead of answering it that childish way.
He can't forget how they supposed to look, he can change there appearance when he want to change his style. You want to say he can't draw serious expressions ?

when he does it very well. "I want examples of these cartonny expressions while it suppose to be serious"
Zodiacs have good design, they are zodiacs, they look like zodiacs, and clothed like zodiacs.
I mentioned about the mafia, the bodyguards are supposed to be normals, with there suits. But he succeeded to give us different designs for each one.
You can dislike the style, some like to see super hero clothes and full of pockets, with hair in many colors, especially if they go with these clothes.
But you cant' say that it's bad if they are wearing what they are supposed to wear.