Have you discussed this with your principal? What about the Fine Arts department. I think your goal is a perfectly acceptable one! There should be a seal for fine arts!

If you haven’t already, I would definitely ask the powers that be what they would need to make this happen. Signatures? How many? Perhaps you could speak at a school board meeting? Who decides what ‘seals’ are appropriate? Your school or the local dept of education?

Sounds like you have a pretty good head on your shoulders. Just be sure to do a little research!

If you go the petition route it is not necessary to include your name in the body of the petition. Signing the petition first let people know that you were the author.

Good luck.