I love your art, but I just wish you didn't feel it necessary to 'age' characters or change them around in order to do an illustration. I prefer an interesting take on a character as they appeared in the TV series/movie. You've certainly done that plenty of times in the past, so there's no reason you couldn't do that with Azula.
Sometimes the rules here would keep me from doing what I want. There are some people who blow the whistle on artists. I've been nabbed a few times. Sexualizing a character is apparently very subjective. So I do what I do.
The rule says "Attempts to "age" the characters in order to depict them in a manner which would otherwise be prohibited will not be granted any exception." Obviously, this is subject to a LOT of interpretation. Anyway, I just prefer something more creative.