Technical issue - explanation needed

If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html

Welcome @f@ber to Stock.  It's important to review your images at 100%-200% magnification.  At those views, it is much easier to see some of the technical issues.  Here is a little snippet of your image at 100%.

The colours seem oversaturated and not natural (especially the sky background.)  The highlights on the flower petals are a bit blown out and if you look at the top of the flower on the right, you will see the blue halo around the flower which is usually caused by high contrast in lighting.  There is also a lot of noise in the background of the image and that could be caused by the increased colour saturation.  Ideally, stock customers are looking for naturally coloured and toned images.  It's the same reasoning Adobe Stock don't want images with filters, vignettes or converted to black and white - customers can do this themselves to fit in with their projects and needs.

On a side note, photographing flowers is a great way to work on your photography and post processing skills, but the subject is heavily represented already in Adobe Stock.  Just be aware that if you do get the flower images accepted, they probably won't be big sellers just based on the competition you would be facing.  That being said, I do like the juxtaposition of the flower you shot going through the chain link fence.

Being new to stock photography, here are some resources you may find useful.

• Quick start guide - https://helpx.adobe.com/stock/contributor/user-guide.html
• Stock tutorials - https://helpx.adobe.com/stock/view-all-tutorials.html

Best of luck in your future submissions.  I hope this helped.