Understanding the concept of "Similar Images"

Hello.
The above pencil tiger portrait failed review due to "Similar Images Already Submitted".
When I searched my archive of images named tiger that I had previously submitted to Adobe Stock, I found the following:

I still can't understand what is meant by "Similar Images" and what is not.
For example, about a week ago, another friend opened a topic on the forum because he couldn't see his own work, me and other friends said that he couldn't see it because there were some restrictions for Turkey, maybe you remember.
When I looked at that friend's archive, his approved visual portfolio consisted of a groom and a bride's designs, in the form of drawings from beginning to end, with small differences. Hundreds of images like this.
Or at one point, I somehow came across another participant's portfolio, there were maybe 30 photos of a young woman and a young man in a factory, again with small differences, approved: The location is the same, the people are the same, their clothes and accessories are the same, etc.
As I said at the beginning, what are "Similar Images" and what are not, how can I learn this?
Thank you.
[Moderator moved the thread to the correct forum]
