You may not use ANY editing tool to move, remove or duplicate any element of your photograph that would change a typical viewer's description of the photograph (aside from color), even if the tool is otherwise legal, and regardless of whether you intended the change when the photograph was taken.
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You've done something a little strange with this shot, and my guess is messing with the curves to black out the background (or achieve some other effect) but it has resulted in a weird look to everything which doesn't help at all.