Hi, I keep getting 90% of my pictures rejected because of quality issues

Your first photo has noise, under exposed shadows, not very crisp and has several IP and model release issues.

The second photo is not focused.

The third photo is monochrome, is not focused and has a white halo.

The rejections are warrented. 

90% rejection rate is not so good.  Maybe you're not going about this the best way possible.

1. Have you carefully read the Stock Contributor User Guide and submission requirements? 

Adobe Stock customers expect the highest visual and technical quality for use in commercial projects.

• https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
• https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html
• https://helpx.adobe.com/stock/contributor/user-guide.html/stock/contributor/help/photography-illustrations.ug.html
• https://helpx.adobe.com/stock/how-to/tips-stock-image-acceptance.html
• https://helpx.adobe.com/stock/contributor/help/vector-requirements.html

2. Did you select 5 of your very best quality images and edit them sufficiently to remove unwanted artifacts & imperfections?

3. Before submitting, did you compare your final work with current Stock inventory to ensure that it's as good or better than what Stock already has?

4. Would you buy this work?  And if so, what would you use it for commercially? 

If you answered "no" or "I don't know" to any of these questions, it's probably not right for Stock.  Don't submit.  That should help reduce your rejection rate.

Good luck on your next submissions.

Your first isn't sharp, but it also has IP problems and you will need model releases.

Your second is completely out of focus, has artefacts (arrow) and noise (cloud).

Your third is monochrome and has a lot of noise.

Check your pictures at 100% for sharpness and 200% for artefacts.

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

If you are a generative AI contributor, please look into these instructions and follow them by the letter: https://community.adobe.com/t5/stock-contributors-discussions/generative-ai-submission-guidelines/td-p/13549435

(If you do not see the picture I post, make sure you return to the forum, not email).

This is not sharp, it is completely out of focus or blurred for some other reason. There are also terrible artefacts for some reason. Look at the halo round the plant.