That and the internet is full of nude bodies and nobody would notice the website. Even if he publishes the site but does not send links to it to others, I can guarantee you that nobody you know will even happen on the website. When celebrities leak nudity on purpose in an effort to get the attention of the public, they employ a whole machinery to make the public aware of the leak. By itself, the leak would go unnoticed.

And even if he sends the pictures, it will not be the end of the world, but I would still advise your teachers ahead of time that they might receive such links, because your advising them is proactive. Waiting and worrying and trying to do damage control is all reactive. Being proactive gives you more power and control. You can give the teachers his email address and ask them to blacklist it in their email clients, saying that you do not want them to inadvertently open the messages he might send. It would not prevent him from sharing via non-email tools, but it would be a step in the right direction.

To cross all t's, you can send him a letter telling him to stop, so that you have a record of explicit objections to his sharing your photos that remain in his possession with anybody. It is probably excessive, though.

There is nothing in the photos that the world has not yet seen - that is for sure.