As promised! I took some pictures from the gallery section of “うたの☆プリンスさまっ♪-OFFICIAL-GUIDEBOOK-～Ｑｕａｒｔｅｔ～”
It includes all the cover arts (Normal and Limited Edition of the game covers), some new arts (the cover of the book), and the CD cover art as well. I haven’t taken pictures of the character sections and others yet. But it’s just the same as normal Guidebook, there are information of each characters, descriptions and in-game CGs.
Can I just tell you how much I love the original official art of UtaPri? x333