Kay.
I have three ways, two of which include viewing the page info and then viewing media info.
1. Right click the picture, and go down to where it says 'View Image Info'. It will pull up the pic in a separate window, and allow you to copy paste the web address of the pic, to upload the pic from the internet. This is also doable if you right click the pic and go down to properties (although it shows in a differently-formatted window).
2. Go up to the top of the window where it says 'Tools'. You can also go down from THERE and choose the option to 'View Page Info". In that window, choose the tab next to the 'Page' tab, which should say Media. By 'Media' they mean images, GIFs, etc. You scroll down to the web address corresponding to the image you are looking for, and then copy-paste it from the page.
3. Save the pic to your desktop and then upload it from your computer. You can delete it afterward. Though the first two options are likely the best option if those asinine picture hogs try to block you somehow from taking their pics.
And if they don't let you copy it directly from the page, then you can always do my favorite option, which I will detail if you like.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)