I would say that the principle means of characterization employed by the author is dialogue. Since Romeo and Juliet is a play, everything we know actually comes from the conversations, be it a dialogue, or a monologue.
Answer: The focal point is the space station, the color is black and white with an etheral blue hue, there is texture on the planet or moon in the background, and also the shadow is under the station on the moon. The whiteness of the moon and the darkness of the space that is seen in the upper third of the picture contrast greatly.
