I was quite surprised by the contents in the new K-ON! Super Illustrations Vol. 1, as it features a combination of official art by the manga creator Kakifly (かきふらい) and tribute illustrations by a wide range of well-known (and relatively unknown) artists. It's an interesting mix, and it just makes me think they didn't have enough of either to put out a full art book. But seeing as how it's labeled as volume one, we can be expecting more of these in the future.