It could symbolize something related to saving or the value of small amounts. Maybe she's learning about money or it's part of a story about frugality.
Hard to say they have much in common. The Hindenburg political cartoon is probably tied to a particular political moment or viewpoint. Jekyll and Hyde, on the other hand, is a famous literary creation exploring human nature. But perhaps they could both be used to prompt reflection on various aspects of society and human behavior.
Hentai lolis mangas typically contain inappropriate and potentially illegal content involving underage characters in sexual situations, while regular mangas focus on various genres and themes without such explicit and objectionable content.
In black and white cartoons, mountains can have a stark and dramatic appearance. The lack of color can emphasize the contrast and give them a more artistic or abstract quality. Also, they might use fewer details to convey the essence of the mountain.