UI for enlarging image, showing next image

I have a website that displays items. Each item can have multiple images, but only shows one at a time, along with the item text. The user can click anywhere on an image to show the next image. You can tap, tap, tap through all the images, while remaining on the item.

I also want to add an enlarge function that shows the image full-size. Tap seems the obvious choice for this. Not sure how to fit it all in? Swipe is for swiping through items.

On tablets, there are thumbnails of each image, but I'm not sure I want to take up that much vertical space on the phone.