The girl cartoon character might be leaving school because of poor grades, a desire to travel and explore the world, or maybe the school curriculum just doesn't match her interests and goals.
Maybe she's not happy with the school environment or has some family issues that force her to leave.
It could be that she's not satisfied with her job or the working conditions. Maybe there's been too much stress or she didn't get along with her colleagues.
Maybe she's upset or had an argument. Could be she's headed to a different place for some adventure.
It could be that she's expecting a package she ordered online or a letter inviting her to a special event.
Maybe she's going on a trip or has to get somewhere quickly.
Maybe she's hurt or lost something and is looking for it on the ground.
Maybe she's in a post-apocalyptic setting and needs protection from the environment.
She could be on her way home from shopping and carrying her purchases.
There might be various factors. Maybe there were creative differences or she wanted to pursue other projects. It's not always straightforward to pinpoint one exact cause.
It might show the girl happily walking to school with a backpack, maybe greeting friends along the way.
She might be excited to start a new day at school, with a backpack full of hopes and dreams.