This is an example of packaging artwork. Packaging artworking, like other creative and technical artworking, requires a good eye for detail and a systematic approach as well as technical knowledge. It also helps to have a good design sense to be able to anticipate what the art director expects. Also, you need to understand the mechanics of how a studio operates so you can ask the right questions during your brief to make sure you have all the information you need - for example, regarding design guidelines for the brand in question.