A seascape is a picture of the sea — a painting, a drawing, sometimes a photograph — the way a landscape is a picture of land. You might see waves, a sky, a ship, a cliff. The word is built like landscape: sea + -scape, the piece that means a view or a picture of a kind of place. Artists and people who talk about art use it most. In loose talk someone may call the real view from a window a seascape, though actually the tidy meaning is the picture, not the water itself. If you only mean I like looking at the ocean, sea view is the simpler everyday phrase.