Okay, I think we are getting somewhere.
Evidently, only Google account holders, people with gmail and so forth,
can see a big picture embedded on a forum web page
created with a right mouse click and copy image location in a Google Photo album.
Here is an official Google's "share" link to the photograph I submitted for the calendar contest
that some people were not able to see.
https://photos.app.goo.gl/mD8S3qojmUAwqNw78
If you did not see the photo in the first post on this thread or the calendar photo,
please click on the link above and see if you can see that photo.
It should take you to a Google Photos album web page with the photo in it.
You can click on that image to make it full sized.
It should work for Google account holders also.