Create a realistic scene of a house-ship in the open sea. The house-ship should be light-colored, with large windows and a spacious deck that opens up to the vast ocean. The water should be a deep blue, reflecting the clear sky, and there should be gentle waves lapping against the sides of the house-ship. Include details like a small garden on the deck, a lifebuoy hanging on the side, and seagulls flying overhead to enhance the atmosphere