I suppose there is a symbol here (emprisonned grace?), but not conveying really the grace topic. Anyhow, it's a well photographied image, with a very good lighting, good choice of b/w. Diagonals working well together. Lot's of atmosphere with a simple subject.
An interesting juxtaposition of soft nature and harsh man made object. Although the black and white really allows for the forms and shadows to come through I wonder if colour would bring out the contrast between warm vibrant leaf colours and cold fence?