This is some good artwork we have here.
Though, I would like to mention a few things.
First, the head is bigger then then body, so toning that down would even it out. Second, the back leg does not curve in that certain angle, its better as a almond shape mostly. Also, the back leg seems have a joint where its a round ball, where it supposed to be a rough joint, as a Z. Maybe the paws may need to be a smoother as well, like a thin trapezoid.
I hope this helped just a little bit, take care!