Create a pop-up image in a section
It sounds like you want to have the image pop up as an overlay without leaving the page - is that correct? For that sort of effect, you'll need to use a 3rd-party lightbox or modal library. This is one that I've used a few times in the past that is fairly simple to set up: https://lokeshdhakar.com/projects/lightbox2/
Hope that gets you pointed in the right direction!