"Create an image of a futuristic underwater city where portraits of ancient sea creatures are displayed on holographic screens powered by advanced technology."

Create an image of an advanced underwater city of the future. The city is illuminated by the soft glow of numerous holographic screens suspended in the flowing currents. These screens project vivid portraits of ancient sea creatures- towering giant squids, formidable mosasaurs, and the enigmatic ammonites, recalling the past inhabitants of the ocean. The whole system is powered by futuristic technology, with an aesthetic that hints at sustainable energy harvest from the sea itself. Imagine the city's structures to be harmoniously integrated with the sea life, creating a mesmerizing combination of nature and advanced technology.