Mysterious UFO Encounter in City Square

Prompt:  Giant UFO descending over Center City Philadelphia, futuristic spacecraft, hovering above City Hall Courtyard, bustling crowd of curious onlookers, diverse group of civilians, police officers, military personnel forming protective barriers, tension in the air, noon on a sunny summer day, shadows cast by the spacecraft, urban landscape, skyscrapers in the background, Philadelphia landmarks visible, people in awe, varied reactions, awe-struck expressions, fear mixed with wonder, detailed cityscape, realistic digital illustration, intense color palette of blues, greys, and metallic tones, dramatic lighting casting long shadows, mysterious atmosphere, by concept artist on ArtStation.