Oddly, here the restrictive depth of field was not needed, Indeed, the open background enhances the subject matter. Why? I do not know, but maybe it has something to do with the subject and background, intuitively, being 'one'. - David Lyga
@jtk Thank you again!! @David Lyga Yes!! Thank you !!! @Eric Rose Thank you very much @grahamp Thank you for your comment ;-) Well, lets see, this is the photograph that she took: