Art is something that stems from creativity. This in turn is the ability to present a simple thing in different ways grabbing the viewer’s attention immediately.
Technical skills and computer designing are crucial to graphic design. You need to be good with required software. Unlike fine art, graphic and commercial art are entirely based on computers. Technical knowledge matters.
It is important to be aware of all new developments taking place in the industry.
For commercial photographers it helps if you have a basic knowledge in printing technology. You can then shoot keeping in mind how it will look when reproduced.