Hello and welcome. I am pleased to tell you that half of what you want to know about submissions to stock portfolios is clearly outlined in a document put forth by Adobe Stock Guidelines for beginners. Read everything you can and check your photos for compliance to all the guidelines that apply to your works quality and subject matter. Look at your work at 100+ magnification to see errors, excessive processing, unwanted noise and out of focus or blurred subjects that should be in focus. Basic good composition is a must. You will see how your work measures to offerings in Adobe Stock offerings so study these as though you are a seller and buyer.
The photographs you show here, both before and after corrections are lacking high-quality composition, good cropping, natural even light and color, subject focus and a few more things that I will leave you to discover after you read the guidelines.
Please do not be disheartened by this reply it is my effort to save you time and any more repeated rejections. Send only the work that meets all of the standards set by Adobe Stock. See the link below. Best regards, JH
You can find information similar to what you have requested at this link: https://helpx.adobe.com/stock/contributor/help/rejection-reasons.html
Reasons for content rejection