What's the difference between classical oil painting and modern oil painting?

The European Renaissance pushed the realistic function of classical oil painting to the peak. During and after this period, a large number of classical realistic painters and realistic oil paintings emerged. These paintings leave a deep impression on people with vivid pictures, natural and smooth strokes, natural layout and unforgettable artistic conception, which makes people enjoy the pleasing beauty. The ultra-realistic oil painting, which originated in the 1960s, inherited the fine tradition of classicism and tried to surpass classicism by using modern scientific and technological elements and technologies such as photography. His works are even more delicate and realistic than images, but they are divorced from the original connotation and significance of painting, lacking the sense of hierarchy and dignity of oil painting, and lacking the excavation of artistic conception and spiritual level of characters in painting. Of course, it also lacks the "feeling" of painting and looks more like high-definition photos.