What are the artistic achievements of Du Fu's poems?

He pioneered realistic poetry criticism, with a high degree of patriotism and his first artistic achievement: gloomy overall style and diverse styles.

The second artistic achievement: majestic artistic generalization and meticulous realistic skills.

The third artistic achievement: the poetic artistic conception of stirring images and the emotional imagination of argument.

The fourth artistic achievement: the beauty of rigorous poetic rhythm and the arrogance of twists and turns.