Imaginative Realism: How to Paint What Doesn't Exist is written by James Gurney who has a blog called Gurney Journey which I follow. He's an amazing illustrator and shares his knowledge freely there.
Even though I've ordered this book last week, it still hasn't ship. My review for it probably won't be up until 2 weeks later. Meanwhile you can check out what James Gurney says about his own book.
Imaginative Realism is available at the following links below. There are some reviews on Amazon US already.
Amazon.com | Amazon.ca | Amazon.co.uk | Amazon.fr | Amazon.de | Amazon.co.jp