Keep everything exactly as it is — same Frieren character at the same size and position, same flowers, same banner with text "Фрирен", same bold line art style. Change only the empty central window: make it smaller, a compact wide horizontal rectangle with a clean border, positioned in the open area to the right of Frieren with even spacing around it. Keep the inside of the rectangle completely empty and pure white. Let the surrounding flowers and vines fill more of the freed-up space around the smaller rectangle so there are no empty gaps. Pure white background, no shading, no gradients, no gray tones, no watercolor, plain solid white background.
