Create a seamless pattern that captures the magic and mystery of the deep ocean. The pattern should feature mermaids of various descents and hippacamps, cryptic entities from Greek mythology, swimming alongside luminous deep-sea life which adds an element of fantasy and underwater allure. This underwater scene should appear like a night sky, filled with distant, twinkling stars encapsulated in its vast depth. Amplify the dreamlike feeling with the use of strategically placed cinematic lighting effects. The overall visuals should embody the traits and vibrancy typical of watercolor paintings.