This photo represents unusual framing because it frames the child's face in between the bars. The frame in this photo focuses on only the child's face.
I have not used unusual framing in my past photography, but I plan. I really like unusual framing because it frames things with other unexpected things. I also like unusual framing because it makes the photo alot more interesting, and focuses on one thing.
http://digital-photography-school.com/tips-portrait-photography