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A watercolor illustration of a children's picture book cover. The main subject is a 【cute furry kemonomimi girl with short green hair, cat ears, and green eyes】. She is 【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 "【なかゆびさん】". Below it, brown Japanese text reads "【こんにちは】". On the middle-left, smaller black text reads "【さく・え：とらの】". The image has a visible book spine on the left edge, emphasizing the physical book format.