Hello! Can anyone shed some light on why these photos were rejected? Some from the same batch were accepted. They were rejected for quality issues not similar content. I have marked which were successful and which were not with ticks and crosses!

One or two refused images would have been sufficient.

1. I’m seeing many images with focus issues. Stock customers want well-focused subjects with good details.
2. What’s your money shot?  Crop out & remove irrelevant elements from the frame. Less is more. 
3. Compare your best work with similar inventory.
4. To get accepted, your quality should meet or exceed what Stock is selling and offer customers something unique.

Hope that helps.

Composition would be one of the reasons for rejection–it’s not good!

Read about composition from Adobe help guides:

The basics of photography composition | Adobe

Thank you for your feedback everybody. Much appreciated

Your biggest problem that I see across all of the photos is “composition”. Each photo has distracting objects. Mostly in the foreground and you need to properly place your subject. Follow the Rule-of-Thirds. Some photos also have loss of detail through overexposed highlights or under exposed shadows. Here is an example of both exposure and composition errors:
 

Here is an example of better cropping and composition with exposure correction:
 

The area in focus is narrow, and the flowers other than the one in the center are out of focus.
Adobe Stock prefers images where a wider area is in focus.

The image is tilted, and there are unwanted power lines in the shot.

I think the other photos are similar for the same reason.

I think this one’s counterpart is more visually stimulating, while this one is marred with distractions. Same for the two below it.