How might the Romans have sought to create believable images in their sculptural works, and how do the Roman works compare with the ones that we ha already studied?

Answer 1

We have no way of knowing what you have already studied, but read lots and read carefully among the search results below:

http://www.google.com/search?rlz=1C1GGGE_enUS379US379&aq=0&oq=roman+sculpture+realis&sourceid=chrome&ie=UTF-8&q=roman+sculpture+realism

Let us know what you discover.