It could be the types of image files used. Some will only work in certain browsers. I presume you put everything into a zip folder, and that the HTML Twine game was called index.html? That's the only way I was able to get music to work. Unless you're linking from an image-hosting website, like imgur. That way, you can use internet links instead of computer directories, so any computer can access them. It could slow the images appearing, however.
If you go onto the Twine subreddit, you might be able to get help there. I've found the people on there very knowledgeable and always ready to give advice.