Found this really good article on the Design Observer today, it explains exactly what it is a graphic designer does. Also has good guidelines on good and bad design.
Have a look at the article here
Marian Bantjes, Graphic Designer
The future of aesthetics lies in random generative software such as Processing, but which will become less random as designers gain control of its abilities. The digital will merge with the hand-made like electric guitar and bagpipes, and together they will break down the rigid tempo imposed by increasingly prescriptive and powerful template software.