As for the image - I really like it. To my mind - even if it is the knee, (right or left) that holds attention - the image is holding the viewer and making him or her think about it. I often take in square format - but usually print in rectangle. This tells me that even when I use 6x6, I'm still thinking and composing in rectangles. I think that the images themselves dictate the final shape and, whether it's square, rectangular, octagonal or round an image is good - or it isn't.
Anyway - JMO