empty billboard above quiet shopfronts on a calm urban street, with reflections of the clear sky in large windows

billboard mockup city urban area densely populated panoramic cityscape modern rooftop historical buildings crowded streets people sky clear lighting visible distance environment vibrant bustling mix architecture dynamic signage advertising high definition scene visibility life living shopfronts street blank windows reflective quiet calm early morning evening empty storefront peaceful serene tranquil stillness reflections no movement sound backdrop glass structure vacant canvas frame scenery solitude solitary urbanism minimal background contemporary urbanization ai generated