I'm torn between starting this book, or the other in this series. I had never considered colour by number, especially in an adult colouring book, but the finished images shown at the back of the books have definitely changed my mind. Some are very intricate, and will require more time and effort, but seeing the results of completed images, it will be well worth it. I am so glad I've discovered this series! I would not only recommend this book, I would purchase it as a gift.