To find rejection reason:
On your contributor page, below the black menu bar, click on Rejected.
On the new page click on the rejected image.
To the right of the images you will find the rejection reason for the image you select.
For further help please post the rejection reason here.
Please be advised, that review moderators do not monitor/answer questions on these forums; contributors like yourself do, and rarely staff members. Therefore we do not have access to your file to know exactly why your work was rejected.
Problem is exposure. The background is too dark and the middle of the flower is burnt out:
There is no detail to recover in the burnt out bit - so I think this picture cannot be saved or corrected.