Photos got declined

As others have mentioned here, flowers and leaves are already heavily over-represented in the database, and even if yours were good enough to be accepted it's very unlikely that they'd ever be found or licensed by a Buyer. The possible exception is if you've found a very rare plant species. To verify for yourself, go to stock.Adobe.com and enter the keyword "leaves". There are nearly 71 million hits.

There is noticeable noise in all the images.
Some images are out of focus.
Please check them at 100% on your PC monitor.

Hello,

You have a rather shallow depth of field, i.e., your f/stop—aperture—is too wide, f/5.6. For example, in file 0826.

Read this from Adobe to help you understand the role the aperture plays in photography.

Understanding aperture priority mode | Adobe

They are all too dark. May I point out, that there are millions of flowers in the database. Your photos must be excellent to sell. 

This one is underexposed and the depth of field is a little shallow. As for the flower images, there are literally millions already represented in the database and to have them accepted at all requires a fresh eye and stronger compositions than those represented here to make them stand out.