We tried loads of photographic approaches for this cover before arriving at this. I created this illustration as a last-minute entry to the Cover Meeting, and amazingly it ended up being the finished jacket. Here's the finished cover, plus a close-up of the illustration.
The design of the 'y' made this design interesting. The branches of the tree adds movement to the design and includes a part of the storyline as well. The use of serif type makes the text easy to read.