Aesthetic: I dont know what so say about this one - this seems to be somewhere between planned and candid shot. It looks very pleasing as colors compliment each other and the focus is as such that it draws my eye to the subject.
Technical: Well exposed, good DOF, crip colors. Thats it.
Challenge: The best thing about square crop is that anything would fit into it ...so no comments on this one :)
Conclusion: Ummm... I feel this is above average composition and should have scored a lit higher. As already said, the DOF is such that the attention is drawn to subject, which is good :) Another good thing is that the subject (Do I sound too "robot" when I use word "subject" for humans???) has natural frame would it. I dont if smile would have added a little more to this one :)
I'm by no means expert in area of photography. My comments are purely based on my limited understanding of technology and art behind digital photography. Apart from doing detailed evaluation of your submission, my intent is to learn different styles of photography by critically evaluating selective submissions. If you've got any questions about this critique, please feel free to contact me via email or PM.
I think this is a really good shot. Great exposure, the shallow DOF works well, good composition, and of course the model doesn't hurt. No idea why it didn't score at least a point higher than it did.