majestic unicorn under starlit galaxy with pastel colors and mystical aura

unicorn starlit galaxy pastel mystical magic fantasy mythical colorful vibrant enchanting dreamlike celestial ethereal twilight mountains stars cosmos sky horn mane glowing night universe wonder imagination surreal whimsical fairytale wonderland artistic dreamscape otherworldly serenity beauty tranquility nightsky starry fantasyworld mythicalrealm skyart magicalcreature celestialbeing ai generated