This is a low-key image that i would say is the opposite of the image below as far as how the mood is. Think of being in the room once again, but this time, its at night, where the only light you have is the glow of the moon, thus giving the dim beam of light that comes in the room. Imagine if you came in the room at night and it looks like this, wouldnt you feel a sence of discomfort and unsafety. As if the shadow in the corner was concealing something away from your eye. Or if something was going to come out and attack you suddenly from nowhere.
This is a hi-key image, where the focus comes from the left side where the light is illuminating from. The mood it portrays is asi if your trapped in a blank room, with nothing but one window inside of that room. But all you see through that window is a blank ocean. As if you were helpless and alone, isolated from the rest of the world. the only thing that gives you a sence of comfort is that one window in the room, illuminating most of the darkness thats in the room.