This photo was rejected due to technical problems, I would like to know details of the reason why it was not accepted, please!, Thank you
It's under exposed and white balance is not neutral.
Also watermarks are not allowed.
In addition to Nancy's comments regarding underexposure, the backs of the swans are blown out and there is chromatic aberration as well.
As mentioned, way too dark in general and the back of the birds blown out with chromatic aberration (purple fringe).
If you shot RAW, you might be able to get some details back in the whites. You should also easily remove the chromatic aberration in Lightroom or Adobe Camera Raw.
Hope that helps,
Michael Niessen - Photographer, photo-editor, educator