The focus is definitely on the sharp end of the tack but, IMO, the head of the pin takes up too much of the picture to be so blurry. Maybe would have been better to take the picture form a different angle.
This image is a less than successful in an artistic sense. DOF control is excellant and the lighting isn't over done creating blooms. The subject is less than interesting. Perhaps a different background with a slightly different angle would have helped. A little more thought and better framing would have brought the rating higher.