What is the creative background of Song Huizong Zhao Ji's "Auspicious Crane Picture"?

Song Huizong Zhao Ji (1082-1135) painted "Auspicious Crane Picture" in the second year of Zhenghe (1112) when internal and external troubles were extremely serious. He dreamed of using auspiciousness from heaven to save the Song Dynasty in danger. Huizong was extravagant and corrupt, favored villains, engaged in Taoist superstitious activities, and claimed to be the leader of Taoism and the emperor. In the early morning of the fifteenth day of the first lunar month of the second year of Zhenghe, suddenly there were auspicious clouds, reflecting low on Duanmen. Everyone present looked up, and suddenly there were twenty red-crowned cranes flying around the hall, and two more were facing each other at the end of the owl's tail. People who come and go in the capital all look up and sigh, and they remain there for a long time. He thought this was a sign of auspiciousness coming from heaven, so he pretended to write a poem to remember it. The crane is a symbol of longevity, and Taoists often lie about riding a crane to heaven. This painting is titled "Imperial Paintings and Letters":

On the eve of the first day of the first year of Zhenghe Renchen, suddenly there were auspicious clouds that reflected lowly on Duanmen. Everyone looked up and looked at it. Suddenly, a group of cranes flew in the sky. There were still two cranes facing each other at the end of the owl's tail. It was quite leisurely. The rest were soaring as if they were playing the rhythm. People coming and going in the capital all looked up and sighed, and they did not disperse as time went by. They flew back to the northwest corner and dispersed. In gratitude for the auspiciousness, I composed a poem to remember the incident.

At dawn, the goblet caresses the colorful neon, and the fairy birds announce their auspiciousness and suddenly come to the ceremony.

Piaopiaoyuan is a couple of three mountains, and two of them look like a thousand years old.

It looks like Biluan living in the Treasure Pavilion, but it is not the same as the red geese gathering in Tianchi.

Wandering around and chirping as Dan Que, it makes people know it.