5 - Find the background detracting as it does not complement the brindle coat, collar also detracts, in my opinion. Looks like some blur issues on the face/head.
like this shot very much, I think just the greener all the way through, against the nice redish color of the boxer, would have made it pop so much more, still giving you nice score. 8
My dog had that exact same collar when she was a pup! Beautiful animal and a nice comp. Shadows seem a bit extreme on my monitor. (I.E. pup seems a bit dark)