Sounds like a different publication - mine was blue, and had B&W predominantly, but with some colour shots towards the centre.
AFAIK, the Photonovel for ST II was only ever in b/w. I own the US edition - but the UK edition was also available in Australia, and it was also b/w. Why would they interrupt the flow of a b/w story to add random colour pics in the middle?
The TMP Photonovel, also by Richard Anobile, was in full colour - similar deep blue cover to ST II. There was also UK and Australian editions of the Roddenberry novelization and those had a section of captioned colour plates in the middle, unlike the US edition.
Knowledge to you maybe... I wouldn't call it common though.
Any fan worth their salt follow "Starlog" magazine in those days and the scripted face-in-the-porthole scene was a commonly known-about cut scene. Ditto the Marla-painted family portrait that went unused. What didn't get a lot of publicity at the time were the pics of the toddler-in-rags crawling around the Genesis Device in the transporter room.