What are the concepts of formal language and artistic language of oil painting?

In painting, the expressive language of oil painting refers to the use of painting elements such as shape, color, point, line, surface, brushwork and texture to create a visual image with vitality and formal beauty. In the way of expression, we do not seek the realism of natural expression, but pursue the grasp of "inner truth" on the basis of in-depth research and processing of natural landscape. Its formal beauty also mainly refers to the appearance beauty of shape, color, texture, brushwork, rhythm and rhythm presented in the picture.