Which rules of the neoclassical tradition art did the impressionist rebel against?

Impressionists rebelled against several key rules of the neoclassical tradition, primarily the emphasis on realism, idealized beauty, and historical or mythological themes. They rejected the meticulous detail and polished finish characteristic of neoclassical works, opting instead for loose brushwork and an emphasis on capturing the effects of light and atmosphere. Additionally, Impressionists often focused on contemporary life and landscapes rather than grand historical narratives, challenging the established hierarchy of subjects in art.