In general, I like this photo a lot. My criticism would be that because the subject is the only thing in the frame, the shallow depth of field isn't serving much purpose. "Sharpness" isn't usually a big thing for me but, here, I feel like I would like it all the be as sharp as possible. It seems like there's a little bit of ghosting at the bottom of the picture that I find very distracting. I'm nitpicking but, for me, when the image is so reductive it forces greater scrutiny.