I�d like to put this on a window in a bathroom. It won't get wet but would be subject to some humidity from shower. Will this work?

As long as it does not get direct running water contact it should hold up well. The nice thing about the static films is that they can be cleaned and then reinstalled if they should ever come down. We do offer a couple adhesive rice paper patterns if you are interested as well. https://www.decorativefilm.com/product-search?Search=rice+paper