Artifacts Problem

This photo was rejected for "Artifacts Problem". I'm new here and in the photography world. Could any of you help me to understand better which exactly is the issue? Thank you in advance!

This photo was rejected for "Artifacts Problem". I'm new here and in the photography world. Could any of you help me to understand better which exactly is the issue? Thank you in advance!
The photograph you posted shows up on my screen as only 3X3 inches. I would need a larger view to try to see the problems. The sky has an odd texture and extra strong colors in sharp contrast to the dark sea and boat. Exposure might be the problem. You can try using the camera raw filter in Photoshop. I am sure someone can tell you how to enlarge this photograph for posting here. Best regards, JH
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