He's cute.. Nice designing and all.
I like the background, I think it suits the image though yes.. the sky could use with some more depth, another shade of blue tossed in as well or something.
The brown from his muzzle going down the neck should start travelling to the center of the collar bone, not stay on the side like that, you'd think someone's chopped his head off and stuck it on a different body facing the other way. Your tail is -massive-. A bit too thick at the base and much too long.. at least when it's that thick. He needs some feet too, but I can understand chopping them off, feet can be annoying.
Overall a lovely design and concept and well done.
Cheers!
Happy hunting!
~Pika!