This is the 12120th most frequent Russian word.
изображены
"Depicted" or "portrayed."
In this sentence, "изображены" is used to describe that mountains and a lake are depicted in the painting.
На картине изображены горы и озеро.
The painting depicts mountains and a lake.
Here, "изображены" indicates that characters and their stories are depicted or represented in the book.
В книге изображены герои с их историями.
The book portrays characters along with their stories.
"Изображены" in this context means that the buildings of the old town are the subject or depicted content of the photograph.