Quote PaulMurrayCbr:
If you upload a photo of the Linoln Memorial - meh. Upload a photo of the historically important bridge over the darling at Wilcannia, and they accept it straight away. Because no-one else has done it yet.
Makes no difference if there already one thousand photos of Wilcannia bridge , if a new photo meets the acceptance criteria it too will be accepted.
The reviewers have no idea how many previous photos of a subject there are. Do you think each reviewer has time to check whether or not similar photos exist ? If they wasted time doing so they would only review a handful of shots per day instead of thousands as they do now.
I don't think you've quite got the hang yet of how Panoramio/Google Earth works

Photos aren't added instantly to Google Earth. Occasionaly it may be only a few hours or a day , but it it is
never instantaneous. Often there are delays and it can take much longer.
For instance , no photos were added to Google Earth during the month of November. It caused great concern among the members.
Quote PaulMurrayCbr:
My next project - visit every embassy and high commission in Canberra and snap a photo.
Sounds like a very worthy project. Please try to make the photos as good as you are able to , not just snaps.