The image you've uploaded isn't full size, so it's not possible to evaluate it properly. However, I can tell at a glance that you've over-exposed the highlights which are blown out in a few places and have also underexposed the shadows. The dark, messy background is unattractive, and the light is harsh. Keep in mind that Adobe Stock is absolutely saturated with flower images; in order for yours to be accepted it would have to be perfectly executed in terms of exposure, focus, lighting and composition. However, don't consider this a "Submission Failure" but rather a learning exercise. I would suggest that you practice your photography skills on flowers, but look for some other subjects to focus on for Stock sales.
Hello @MACUACUA RO , look at your photo at 200% and you will see green halos around the leaves, artifacts in the background shadows. Also your photo's highlights are overexposed so that the details are lost and the photo is not properly focused.