Problem: I am creating an Artist directory and gallery site that provides artists the ability to upload their own artwork images. I have created a Form that allows artists to upload multiple images into a repeating image field. I would like to give artists the ability to apply taxonomy terms to each image in the custom field.

Solution: It is not possible to apply terms to each image uploaded in a repeating custom image field. If you need the ability to add taxonomy terms, you probably need a separate custom post type. Artists can then use Forms to create a new post for each "Artwork", and apply taxonomy terms as needed to that post.