i think he looks great in the pictures. Sure its short, but its done very nicely. Some people like their yorkies this short. If you didn't say that your groomer did something "wrong" then none of us would be any wiser. He looks great!
Sometimes i think people get this idea in their head of what they want their yorkie to look like when they pick up from the groomer and are disappointed when the image in their head doesn't match the dog they get back. Then in a few days you get used to the new cut and really like it.