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:
Is this for guitar? I added a screenshot of a site that may help u
Explanation:
The answer to your question is a paragraph
1.First notes above treble clef staff are G, A, B, C
2.First notes below treble staff are A, B, C, D
3.First notes above bass clef staff are B, C, D, E
4.First notes below bass clef staff are C, D, E, F