If this is true it is a great opportunity. Just be patient and play it cool for maximum long term benefits.

Asking her directly for hair play would be risky unless she gives you explicit signs that she is interested. Buy a book on hair-dressing and keep it in open view of her. If she asks, tell her that you are pursuing a course in hair-dressing to augment your income.

If she is a poor student she might actually volunteer for some "hair treatment" to save money. If she doesn't ask her if she would like to help you with a class assignment.

And of course don't forget the pictures