Are there any photos of the Qianlong period?

No

The world's first photograph was taken in 1826 by French scientist Joseph Nicéphore Niépce at his home, titled "In Le Gras" View from the window". This photo shows the courtyard and outbuildings as seen from an upstairs window of his home. The photograph was created by exposing it to a piece of asphalt metal within a pinhole camera.

Qianlong lived earlier than this: Hongli, Emperor Gaozong of the Qing Dynasty (September 25, 1711 - February 7, 1799), whose surname was Aixinjueluo, taboo Hongli, was the third emperor of Yongzheng Emperor. Four sons.