Output wp_link_pages as raw url

If you take a look at the link generated by the <!--nextpage--> tag, it just appends /2 for page 2 /3 for page 3 and so on. In other words, it adds a query string page=page_number to your post link.

So all you have to do is insert an hyperlink to your image with the next page number for that image.

you still need to add the <!--nextpage--> tag because that will break your post in multiple pages. If you don’t all your images will all appear on each paginated page.