@dellana:
May you can this option to get your image for seen the fullscreen mode at other tab browser without linking to another site (here is avaible option on your own url)
Here is bellow the step you can follow:
1. Turn into your image location
mean: – if your image were inside your post/page you must EDIT them (POST/PAGE) again by pushing it on your dashboard and if the post/page has opened and avaible to edit (on your word post, viewer and editor),
2. Next step, you can CLICK ON YOUR IMAGE which you can got like a mountain-view logo (there is any word tag EDIT IMAGE) click that logo,
3. So now you got javascript view on your browser, right?. after that, you can bring your mouse to LINK TO IMAGE option. click that, there is will automatic generate your own link,
4. The last step, don`t forget to click on UPDATE for saving your preference,
5. All step is done and you can UPDATE your post/page change.
Don`t forget to check it was working.
for sample you can see my post at HERE
also you can see that working like HERE
good luck