From the profile that the images are on, click the "Images" green tab, near top of page. Then click on the image you wish to delete - it will open in new page. Scroll down page and on left you will see (very small print) the name of the profile it is on, with an option to "Remove" that person from image.
Then be sure to scroll a bit farther down the page to "Save" that edit.
It will then become locked privacy with a red padlock and eventually be dumped.