And it says, "share one photo" Then you have 3 or 4 choices: Click BBCcode. That should then show the URL which has a jpeg on the end. It also lets you pick a size for your photo(go to at least the 1028 wide).

Copy and paste that(which I just did for my last photo - I'll paste here [url=https://flic.kr/p/GfbH6u][/url][url=https://flic.kr/p/GfbH6u]IMG_0034[/url] by [url=https://www.flickr.com/photos/131670316@N07/]Tom Young[/url], on Flickr

Then you can just copy and Delete the extraneous code outside of img in brackets. Which I will do below:

And you get just the image