There is no uniform standard for the cover pictures of eighth grade history books, because different publishers and different versions may have different cover designs. However, generally speaking, the cover picture of the eighth grade history book should be related to the content of the book to attract readers' attention.

Take the eighth grade history textbook published by People's Education Press as an example. The main picture of its cover is a picture of an ancient building in China, with information such as the title and author on it, and the logo of the publishing house below. This picture is selected from the typical representatives of ancient buildings in China, such as the Forbidden City and the Summer Palace, to show the glory and long history of ancient civilization in China. This cover design can not only attract readers' attention, but also stimulate their interest in the contents of the book.

In addition, the cover design of some eighth-grade history books pays more attention to the description of people and things. For example, there may be illustrations of famous figures or events in history on the covers of some books, such as Qin Shihuang, Emperor Wu of the Han Dynasty and Opium War. This kind of cover design can show the image of historical events or characters more intuitively, thus attracting readers' interest and improving their reading desire.

In short, the cover picture of the eighth grade history book should be related to the content of the book to attract readers' attention. Different publishers, different editions and cover designs may be different, but these basic principles should be followed.