Why does a comic girl bite her lips?

It could be that she's in a situation where she's unsure or feeling shy. Sometimes a character biting their lip is a sign of internal conflict or indecision.

Well, it might be that the guy did something to annoy her. Or maybe it was a spontaneous act to get his attention. Who knows? The comic could have its own unique and unpredictable storyline.

Maybe they do it to look cute or flirty.

Sometimes, it shows they're nervous or deep in thought. It's a way for the artist to convey their internal state without having to say it explicitly.

It could be a sign of nervousness or anxiety. Sometimes, it's used to show a character is deep in thought or trying to hold back something.

People bite their lips in cartoons for various reasons. Sometimes it indicates shyness or indecision. It can also be a sign of trying to hold back something they want to say. Another possibility is that it's just a cute or endearing trait given to the character for added charm.

Maybe he's just being naughty or having a moment of bad behavior.

Maybe it's a unique style choice by the artist to make her stand out or give her a distinct look.

The reason could be to make the cartoon girl stand out or to depict a certain kind of environment or story. But showing her smoking like that is questionable and might raise concerns about the influence it could have.

Maybe it's a creative choice by the artist to make him stand out or add some uniqueness to his character.