This book cover shows excellent figure ground/negative space. The contours formed by the position of the fox serve as the shape of a boy, I'm assuming "Peter." This empty space also creates a wonderful focal point for the book title to nestle into.
Fish＆ Rice Packaging could do something like this but make it look like the fish is in pain and so it's advertising a company that does everything sustainably, displaying that their company doesnt allow this sort of thign to happen like the bag is showing
Pastal colours (pink, aqua, yellow, purple) - These colours are quite feminine and attract a female audience. They're bright and work well together because they're often split complimentary opposite colours.