I am trying to find out how dawn dupree's work looks like and how it inspired her to robert rauschenberg, edward hopper, sigmar polke and patrick caulfield.

I went to www.google.com, clicked on the word Images near the top left, and entered her name.

http://images.google.com/images?hl=en&q=dawn+dupree&gbv=2

You can do the same with the other names. You can also conduct advanced searches with terms like the following: dawn dupree inspired robert rauschenberg. They may produce good results; they may not. Mostly, though, I think you need to look at these different artists' works and draw your own conclusions.