The main focus of their illustrations is their backgrounds! That's the original reason I purchased the book. They're able to convey so much mood and atmosphere with their compositions and color palettes. It's such a big inspiration. Their style is more on the loose and rough end, but that doesn't distract from their beautifully crafted backgrounds. If you want to learn or be inspired to do more backgrounds that can convey a different variety of moods, I highly recommend this book!