I think it’s a matter of degree. If you share it behind closed doors, with a few friends, it wouldn’t turn any heads (mostly because the target is unaware).
If you share it with the entire class? In the school building itself? It becomes impossible for the target to not be aware.
What if you share it with one person, and that person shares it with one person, and so on, until the whole class sees it? Has no crime been committed?
If person A draws a naked picture and shares it with person B, and it looks like person C, then person C has been sexually harassed?