i think that you pillow shaded it, look it up. you need to decide on where the lights is coming from and keep it to that.
And it feels like its a bit unbalanced, like if it will tip over, head first if it stodd like that. so maybe bend the legs a bit differently. But i lióve the detailed face, it feels alive. Make the stripe on its back not so straight, so they also feels more realistic and alive