Photos Quality Issue

15: the girl is a shark with at least 2 rows of teeth:

11: Alien eye:

Artefacts:

…and an urgent need to change the dentist:

9: not in focus:

(neither is the girl). Check also the boy's teeth. It could be a natural defect, but for an AI, I would tend to a display error. The girl also needs some teeth refining.

And the hand has been named multiple times here, it's a classic:

Moreover, less important, but for AI it should be perfect, check the other hand. Looks as it comes from a different body, besides this extreme chromatic aberration:

In addition, the pictures should have the sRGB colour profile embedded. I doubt that you will get a refusal for that, but still, it is a violation of the rules.

If I re-submit, will it flag my account for spam?

By @Robert308832053b7k

If you do not address the issues and do that a lot, sure.

(...) but received the approval for others that look almost exactly the same.

By @Robert308832053b7k

That may also be considered as spamming.

I used facial restoration software (GFPGAN) to fix the eyes and teeth. Camera Raw Filter also showed some burned out highlights in the man's hat and side of his face, so I lowered the highlights then increased the exposure. My advice: no matter how good it looks, always run portraits through facial restoration software and you'll see improvements 99.9% of the time. Though occasional they only make things worse, especially with portraits in profile.

All that said, I'd take this image further if it were mine. I'd brighten the whites of eyes a little, and the man's could use a little work.

As for the two school friends, again...facial restoration for the eyes and teeth. The young man needs some catchlights in his eyes. Facial restortion might do this for you or you can add them manually. They're faces are also a little soft compare to the other two images.

You can TRY facial restoration on the black couple to fix the teeth but.  as mentioned, things can sometimes get wonky with 3/4 profiles. 

First of all you use the word photo in the file name. Second they are png and should be jpg.

In the second image, look at the guys eye. It is red. The sky is over exposed and there are some focus issues.

Not sure about these. If one looks very closely, one will find errors! If you have others that were accepted and they are similar, I would leave these ones and move on. Don't waste time on these ones!

The one with the woman smiling  (checked flannel shirt) reminds me of the Joker's wife! 😊