Of all the images for a picture book, the jacket art gets the biggest going-over.  I sent 4 rough thumbnail ideas to Kerry Martin, the senior design editor (in the olden days there was an art director and an editor; Kerry’s title reflects the melding of those 2 positions over the years).  Number 2 was chosen—the silhouette of the gondola makes a nice graphic shape—and I worked up a tight sketch.  You can see the painting in progress.  I liked the idea of a nighttime scene, with Venice reflected in the canal.  Next, the comprehensive layout—or ‘comp’—with the sketch and the type combined.  Originally I was to hand-letter the title type, but the treatment Kerry came up with looks so good we all agreed not to mess with it.  Finally, the finished illustration.