I did the main illustration quite quickly, all freehand in photoshop, but using the lasso tool to both add and remove texture from the wolfs fur. It worked quite well so I'm hoping to use he technique again in the future. The cover text was slightly more problematic. Because the picture was high contrast and in simple colours, it was very difficult to make the text stand out in any colour other than white, which annoyed me slightly as I'd tried very hard to not use white anywhere in the image - and its doesn't appear anywhere else on the front or back cover design. This is something that's likely to bother me more than anyone else though, so after several hours of mucking around I left it as it is above.
Below are the roughs I came up with to start with (I knew early on I wanted to do something almost designey - using silhouettes, just had to decide what, and how), and the full cover layout.
Putting the flying quail in the spine logo was one of the last things I did - and possibly my favourite thing on the cover now, if I'd have thought of it earlier, it could have gone in a totally different direction.