The picture is beautiful, the colouring is great and the anatomy just perfect, the expression also gives him a lot of personality. Just a comment, however, the scale between human, wolf and werewolf seems wrong. If the wolf really is 55" tall, then the human would have to be 110", because the wolf reaches his waist. The average human is about 67", so the wolf's shoulder should reach the human's chest.
Yes, but the way I understand it the height he listed refers to the wolf, not the werewolf, so that means the wolf should be gargantuan, not the werewolf short o_o Those height things are tricky to put on a reference, lots of people get them wrong, if you are going to put them there you should try being a little more careful, even more when the person gives you specific numbers.
(Just a note too, one foot is more or less twelve inches, so you just divide the inches by twelve, which means the wolf is 4,5 feet tall. I don't use feet or inches, but according to a converter I found that is the proportion)