Rechazadas por problemas de calidad.

These are rather underexposed and the DOF is too shallow, causing most of the images to be out of focus. I wouldn't even bother uploading floral images to Adobe unless you've found a very rare species, as there are already many millions of such images in the database.

Lack of strong and interesting composition is the main issue for me. Do a search for flower images on Adobe Stock and take a look at your competition.