Found a new color photo of John & Cynthia on an ebay auction listing -
posted in the 1964 Miscellaneous album. It's a candid snapshot from a
private collection taken in December 1964 at John's cousin's home.

The photo description says - John Lennon sitting on chair with first
wife Cynthia beside him . . . Michael behind. Hand written wording on
back says 'John was "Grumpy that day" Cyn, Michael & John "Aramore"
Rock Ferry Dec 1964 Michael is my sister Ann's son, & Johns cousin'

There is a set of four for sale, but they're too expensive for me!
See ebay auction #: 270194266152