That's Korean and Japanese style, not Chinese or Indian. In India, Thailand and Cambodia, they use very big statues, very colorful. But that is not Hinayana style, only Indian or Thai or Cambodian style. In Hinayana, they have Shakyamuni Buddha statues, but no bodhisattvas. Bodhisattvas are part of Mahayana tradition.
Chinese style is very colorful, so they have large and colorful statues of the various bodhisattvas.
In Korea, they have only middle size statues, not quite as big as Chinese style. Buddhism came from China to Korea and then went to Japan. There, during the period of Nara Buddhism, they built a very large Buddha at Todaiji which was the largest Buddha in the world. Also, during the Kamakura period, they built a huge Buddha outdoors. For some people, when they look at a small Buddha, there is no such feeling.