Maybe it's because of the weather or she's wearing thin clothes.
There could be several reasons. It could be that she's in a cold environment, or perhaps she's had an emotional experience that makes her seem cold. Also, the style of the cartoon might intentionally depict her that way to create a particular effect.
The cartoon boy might look cold because the artist intentionally designed him that way to create a certain mood or tell a particular story. It could also be that he's just had an unpleasant experience that makes him seem cold.
Maybe she saw something unexpected or got a big shock.
Maybe she had a long day or didn't get enough sleep.
It could be due to the artist's style or creative choice. Maybe they wanted to create a unique or unconventional character.
The cartoon girl might look tired because she's just finished a challenging physical activity or she's been dealing with a lot of responsibilities and it's taking a toll on her.
Maybe she stayed up too late last night.
Perhaps she witnessed something terrifying or heard a loud noise. Those could be the reasons for her scared look in the cartoon.
Maybe she has too much homework or a big test coming up.
It could be that the combination of colors used for her and the background creates a humorous effect, making the girl cartoon hermit look funny. Or perhaps it's the way she interacts with other characters in odd ways.
It could be that she lost a precious item or received bad news. Sometimes in cartoons, characters show emotions for various reasons that aren't immediately obvious.