There is a lot that goes into each graphic designed piece of work. A trained graphic designer knows the rules/principles of design and how to apply those rules to create a look and feel that is most appealing to the targeted audience and on target with the message.
Design requires time (usually hours), research, consistent effort, and oftentimes many, many edits. A good design requires lots of thought and evaluation to construct the “perfect” picture. Very rarely does a good designer just throw something together without any thought behind it for the sake of getting a job done. Many factors are involved and must be considered.
The finished product, if done well, is a work of art worth acknowledgement and appreciation for accurately conveying the intended message.