A serene scene of a young woman enjoying a natural hot spring bath. The woman has shoulder-length brown hair styled into a casual updo with soft bangs framing her face. She is in the center of the composition, partially submerged in the milky blue water of the onsen, creating a tranquil and intimate atmosphere. Her skin glows softly, accentuated by the diffused natural light coming from the top right corner, which casts a gentle reflection on the water's surface. She is holding a small collection of smooth stones in her cupped hands, and her expression is one of contentment, her gentle smile complementing the calm ambiance. The background features slightly visible stone structures, adding context to the outdoor spa setting. The color palette is dominated by soothing pastels and earthy tones, with a strong emphasis on the aqua hue of the water. The image has a soft focus and dreamy quality, enhancing its peaceful mood.