プロンプト
A watercolor illustration of a children's picture book cover. The main subject is a {argument name="character appearance" default="cute furry kemonomimi girl with short green hair, cat ears, and green eyes"}. She is {argument name="action" default="smiling happily while holding up her middle finger"} with a white-furred hand. She wears a green garment with a fluffy white collar. The background features soft, painted green foliage and small yellow flowers on textured paper. At the top, large hand-drawn green Japanese text reads "{argument name="main title" default="なかゆびさん"}". Below it, brown Japanese text reads "{argument name="subtitle" default="こんにちは"}". On the middle-left, smaller black text reads "{argument name="author text" default="さく・え：とらの"}". The image has a visible book spine on the left edge, emphasizing the physical book format.