Advice On Image Quality Please

Different Stock agencies have different quality requirements.

Tulips: unsharp, noise.

I would recommend that you do a search for flower images on Adobe Stock to see how they compare to your own. There are millions of flower images and the competition is tough even amongst the most unique compositions.

Check your images at 100% magnification before posting.

Raindrops on Dahlia.jpg

It's unclear whether it has been compressed or expanded.

Tulips.jpg

Poor composition. There are so many registered flowers, so I think it would be better to think of something that is easy to use as a material.

Hebe.jpg

The subject appears out of focus

Raindrops on Dahlia.jpg

The bokeh of the petals is not pretty.
You can see the spider's webs.
For commercial photography, try to eliminate unnecessary elements as much as possible when posting photos.

Indeed, acceptance on other stock sites is no guarantee of acceptance on Adobe Stock.

Raindrops on Single Alchemilla Mollis.jpg - DOF is too shallow, and little is in focus

Hebe.jpg - same issue here

Tulips.jpg - one tulip is in focus and the other is not

Raindrops on Dahlia.jpg - noise in the background

Shooting everything in portrait rather than landscape mode is usually a clue that the images were captured with a cellphone which might have contributed to the issues.