What are the most ornamental and representative cartoons in various countries?

Japanese Animation: The Works of Miyazaki Hayao and Osamu Tezuka

America: The Works of Disney and Pixar

There are few Korean animations, and I know several representative works, such as the Five-year-old Temple, the Millennium Fox and the unlucky bear.

I suggest you look at the cartoons made in China before the reform and opening up, such as "Make a scene in Heaven", "Little tadpoles looking for their mothers" and "Adventures in Heaven".

In fact, there are many French animated short films that are also very good. I recommend you to have a look. For example, Love Story of Octopus, also known as Octopus Couple, is a very good animated short film.