Chicago cityscape, winter scene, snowflakes gently falling, Willis Tower, John Hancock Center, Tribune Tower, Wrigley Building, modern skyscrapers, historic landmarks, frozen Millennium Park, ice skating rink, bundled up tourists, scarves, hats, gloves, warm coats, holding cameras, taking photos, low-angle shot, cold blue tone, frosty window reflection, urban landscape, city life, vibrant lights, evening atmosphere, cloudy sky, snow-covered rooftops.