Do you have an example of the "text"? It's difficult to answer a question like this without seeing the text itself.
Main pieces of imagery can be something describing how stuff looks, smells, feels, or what it sounds like. It should create a picture in your head. So whatever helps illustrate the text for you is an example of imagery! Hope this helps!
Part of a sentence or clause containing a verb and stating something about the subject
Fewer employs would be the correct terminology since you are not describing what is less of the employs.
