Everyone loved the hardback cover of Blue Remembered Earth by Dominic Harman (me especially), but for the smaller format required for the paperback edition, it was felt that a significant redesign was needed, together with a visual element that emphasized the space-based action of much of the book. In other words, another spaceship.
There is no one spaceship that dominates the action in BRE - I actually tried to make the various craft more like routine vehicles than major characters in their own right - but it was clear that the ship "Winter Queen", which figures in the later action, might not be a bad choice. It also serves as a generic template for the basic look of some of the other vehicles mentioned in the book, such as the Maersk Intersolar liner and the Kinyeti - hopefully conveying a sense that these technologies are only a little more advanced than what we have now.
To give the artist (I think it was also Dominic) something to go on, I provided this extremely rough and ready sketch:
It's very interesting to compare it to the final cover - note the "details don't matter". I liked the final interpretation very much, although I've still a soft spot for the original cover, with its lovely hues and evocation of Earth.