I would like help on why these images were not accepted.

Hello! If you are new to submit AI asset, you may consider to submit non-human AI asset first. To generate 100% correct human images are quite difficult( assume you are using midjourney). It's often you take a lot of time to correct a human image, than got reject after submission. 

You need to check your assets at 100% before submitting, and you need to fix all the errors beforehand. If you can't fix, don't submit.

When posting here, it is helpful to tell us the refusal reason. I assume, it is quality issues here.

Because I find it confusing in some situations where two images have similar characteristics in technique and style sometimes they are accepted and sometimes they are not.

By @alexbedoya.photo

As moderation is done by humans and some people are better at detecting errors than others, you may have assets accepted that should be refused. The first customer will probably complain then.

If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html

Look at the fingers on the first image.