The Photo was rejected.....

Thank you. I am not an expert in photo analysis, so others will surely do different checks. To me. I observe the following. (See picture)

This is a screen shot from Photoshop. You will see the colours are wildly wrong. This is because you did not embed an sRGB profile, which is required. I really like the picture, but the composition is imperfect at the corners. I see a tree at top left, and some debris in the river bottom right. Worse, though, there is something at each corner, perhaps a lens hood. It would be expected that you would correct these problems before submitting, or use a different shot; nobody would run that picture as it is in an advert or magazine, even though it is a beautiful photo.

By the way, I like your picture very much.

Adobe give a reason for rejection. Please tell us what reason they gave so we can help you understand it.

If the reason was "technical issues" you need to post the original file that you submitted, not a PDF, because it could be an issue only visible at 100% or more on the original file.