hello, can anyone please tell me what I have done wrong in the image?

As noted by Michael, focus is not sharp; however your main problem is in selecting a bloom that is in part shade and part sun. There's no way to effectively even out that lighting unless you shoot bracketed images, which probably wouldn't work well outdoors on a moving object. As a result of the poor lighting conditions, you have blown out highlights and dark shadows as well as a messy background. Next time, work the scene, moving around until you find blooms that are in complete shade with a pleasant background. Shooting flowers is a good way to practice your photography and editing skills, but be aware that Adobe Stock already contains millions of floral images, so the chances that yours would ever be accepted or sold are remote.

Hi Oscar,

It doesn't look sharp and some highlights are overexposed (and thus without any details).

There is also some halo:

and this, which looks like bad spot removal/healing brush:

Hope that helps,

Michael

_____________

Michael Niessen - Photographer, photo-editor, educator