Traditional photographers have long been able to create two exposures on a single piece of film. This technique is now also easily achieved digitally - overlaying images using a ‘multiply’ or transparency filter, for example. This example shows how the integration of two different scenes can help to strengthen the ideas communicated within an artwork.
“I know a 'face' where the wild thyme blows, Where oxlips and the nodding violet grows, Quite over-canopied with luscious woodbine, With sweet musk-roses and with eglantine.” William Shakespeare, A Midsummer Night's Dream
I think the pattern from the layer of shadows contributed to making this an artistic shot. I do feel that the repetition has created some movement for the viewer's eye, guiding it through the image. I also found it interesting why the photographer chose to do a side view instead of a front, perhaps so you can see the shadows of the patterns clearer.