この背景なんだろう

2girls, anime style, young girls, first girl with blond hair, short bob haircut, blue eyes, round eyes, (hair bow:1.2), (red bow:1.2), second girl with black hair, long straight hair, purple eyes, confused expression, both with surprised faces, medium chest, casual outfits, first girl wearing blue dress with white collar, second girl wearing purple sweater and white skirt, standing together, turning heads toward background, pointing fingers, tilting heads, eyebrows raised, mouth slightly open, saying "what is this?", pastel colored abstract background, gradient colors, floating shapes, strange patterns, dreamy atmosphere, indoor setting, (colorful pastel background:1.3), (confused expressions:1.2), side by side pose, full body view, (masterpiece:1.1), (best quality:1.1), (very aesthetic:1.1), (absurdres:1.1)