The "CADENCE" package is a good example of a quality design solution. The designer utilized a refined color palette (in this case the power palette), a single typeface, a unified design theme that flows from page to page, inclusion of all necessary information, and necessary legal information (barcode, anti-piracy seal, parental advisory tag).
Also note that the student prethought every aspect of the sleeve prior to construction. The student scouted shoot locations, arranged the usage of a photographer, screened possible models, costuming, makeup, etc. prior to beginning the project.