There's still a few things I need to tweak but here's the island and tree using a few brushes in SketchBook Pro. I added some daisies for color and to add a little excitement (pickin's are pretty slim when daisies add excitement, don't you think?)
I think I'm going to add foliage to the top... in fact, it'll become a solid forest green back lighting our lettering, which will probably be white. This is one example of how the project got away from me; I didn't make the foliage tall enough to suit the book cover and now I'm going to have to work around that.
Bummer. But now to color in and add Wally. Stay tuned.