Lovely photo, the dog looking down is a great touch. I would say though that the child's face is not quite sharp enough and I would have put the subjects slightly fuller in the frame.
This is a nice boy and his dog shot. I'm not sure that duotone is working very hard here. Placing your models in front of a less distracting background would have gone a long way toward making this fabulous instead of just cute. It is a bit high key for my taste. It looks like exposure came from the sky instead of something more neutral--the boy's face or the dog's fur for instance. See how the detail in the white sneakers are completely washed out? You can't see where the sneakers end and the socks begin. The subject does meet the challenge.