While this is a good sketch at a level I probably couldn't do with female characters, I notice your characters have slightly short legs, which is fine for a certain art style especially anthros. In this case though, it almost looks as though the legs could be the same length or shorter than the arms. It might be the torso length that's throwing me off or something. Or it could be that I'm just used to common manga proportions that look the way they do to fight foreshortening and stuff.
I of course look forward to your next pencil or digital work.