Look at the signature and seal. The author's name is Gong Jinqing.
Gong Gaqing (19 17-2007) is a native of Zhangqiu. The surname is Gong, and the name is vivid, and the word Jin Qing.
I hope I can help you.
Attachment: According to some questions posted by the landlord, the landlord's family is closely related to Zhangqiu, and the relationship between Mr. Zong Cheng and the landlord should be unusual. And this "Mr. Zong Cheng" has a good relationship with calligraphy and painting-there are many good things hidden!