Don't cache my images, I want to change them!

To allow students to enter images/details for a site I’m doing, I am creating an online form. The form includes the option to upload, rotate (and save) a set of images. For instance, if a user uploaded an image and then realised it had been saved as portrait rather than landscape, they can rotate and save the image with a single click. The image is rotated and saved and the page is then refreshed. However, the rotated image is not displayed until the user refreshes the page further, because the cached version of the image (before rotation) is still remains.

Any solutions?