You might try looking in specialized libraries or archives dedicated to cartoons and animation. Some universities or cultural institutions might have such collections.
A retrato caricatura is more exaggerated and focuses on highlighting certain features for humor or emphasis. A traditional portrait aims for a realistic representation.
The black and white cartoon speaker is likely to have a distinct visual appeal. It could be associated with a sense of nostalgia and simplicity. Maybe its black and white tones help it blend well in certain settings or create a specific mood.
Well, sometimes love can be a central theme in mount manga, influencing the actions and decisions of the characters. Or maybe the setting of the manga, like a mountainous landscape, could add a unique backdrop to a love story.