I think the title could have helped you here if you had titled it something like property's edge. The barbed wire is a prominent item in the shot and the building in the bg as well as the sunset would be great negative space to bring out the meaning in that title. My eyes are naturally drawn to the wire here anyway with this composition and lighting so why not use it to your advantage and make it the focal point in the title too which leaves the rest of the image as the bg... thus the neg space thus meeting the challenge. The wire could use a little more clarity/focus though.