I believe the answer is internal belief.
A principal of design that i see in the image is unity because the room represents the ocean and there are fish surrounding which brings everything together and balances out the message the author is trying to get across. hope that helps :)
Answer:
Line, shape, texture, value, form, color and space
Explanation:
Hans Holbein the Younger come to be known as?
a. “King’s Painter”