Yeah, I'm not too sure about that. Street art is a form of freedom for art. The city, or even the world is your canvas.
Here, she seems free spirited, but she's still a teacher and just goads the MC into doing boring stuff (draw on canvas, draw the human body).
So, while the fact that she's naked is supposed to show that she's wild, in the end, it's still all about getting in line and do what society expects of you.