Am am new to the contributor community at Adobe and had a few submissions get rejected. Trying to understand what went wrong to that I can correct going forward.

Quality issues aside, this looks like GenAI. 

• How do you envision these assets being used commercially?
• And who do you think would buy them? 
• What Search words will customers use to find this?
• How does your work compare to other Stock inventory?

Those are important questions to ask because Stock is where designers source commercial quality assets for use in professional projects.

Read your Contributor User Guide thoroughly. It contains valuable information.

https://helpx.adobe.com/stock/contributor/user-guide.html

Zoom in and inspect the designs more carefully. In the first image, some of the orbit lines are incomplete and muddled. In the 2nd image, some of the gray areas are quite blurry. In the 3rd image, there are some blurry areas. In the 4th image, the smoke is incomplete. In the 5th image, some of the lines are incomplete.

Your posted examples are a bit small, but I’d be willing to bet that even at full size, some of these lack the detail that Adobe Stock is looking for these days with respect to AI.