I tried converting The Jungle Book over to your format. What do you think?

Well, if I was doing it, I would completely redo the back - not a fan of the mixed styles - but it is good that your having a go with photoshop. That's where i started a few years ago.
Also - try not to use the magic wand for removing backgrounds for the spine logo's - it leaves a horrible edge on it. For simpler logos, I would cut it out (look at segamers tutorial - as it covers it perfectly) or for something like this one, I try and get as close a match as possible to the fonts, and just rebuild it (which i believe i did for the original version of this cover). Ends up nice and crisp.