Adobe won't accept these photos. why?

They are not photos. They are AI and all have exposure issues.
For instance the iceberg has no blacks or whites and the deer is underexposed with no whites.
Here is the deer histogram.

The image will be rejected because it has poor quality when enlarged to 100%.
The image is enlarged too much, reducing its quality.

• Way too dark (underexposed). See Histogram panel.
• Deer antlers should be symmetrical (the same on both sides).
• Cropped too tight. Not much room for additional text or other elements.
• As a customer, I would find this difficult to use in professional projects.

Read your Contributor User Guide for more tips.

• 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/generative-ai-content.html
  
  

Deer.jpg - the reflections don't make sense - looks like there's another superfluous leg...

A blue whale in the ocean - blue whale has a much longer snout

Beautiful landscape iceberg - definitely not photo-realistic

While they're trying hard to be photorealistic, there is still an AI quality about them. A few months ago, these might have been accepted, but it is becoming more and more difficult to get assets like this accepted. At least I'm assuming they were rejected for quality issues, since you didn't give us the reason. I personally would have classified these as illustrations, not photos.