The principle means repeating some of the aspects of a design throughout the entire presentation. It would also help to organize information that would guide readers. Examples would be using a template,same font size and type,font colour and color scheme.
Answer:
Aren't the elements scale, proportion, unity, variety, rhythm, mass, shape, space, balance, volume, perspective, and depth? If so then I think this is using shape, proportion and maybe space because the lady is in front of the background.
a instrument that causes air to vibrate is a aerophone
Answer:
A?
Explanation:
I hope I am helpful, but it might not be right.