Photographed by a Beatle

 I don't know who exactly took this picture of John and Cynthia- either Paul, George, or Ringo. 

Where's John's photo of Cynthia?

 All three photos taken by Ringo

Taken by George. 

It was shared by his estate (Olivia and Dhani Harrison) as a tribute to Cynthia after her death in 2015.

This photo (both are the same, but in different conditions in color and monochrome) was part of Ringo's collection; obviously Ringo didn't take the picture... Unless he used a timer? It's very possible that George took the photo using Ringo's camera? But there's a camera next to Ringo! Is it his? Or John and Cynthia's? I don't think we will ever know for sure.