Here is a web site that tells you about the Yorkshire Terrier breed standard:
Ojibwa Yorkies
Also, if you go to reputable breeders web sites, you will see many pictures of how a Yorkshire Terrier puppy is SUPPOSED to look.
Below is the website of a wonderful breeder named Glenda Beavers - she is a very well known show breeder who breeds to the breed standard. This should help you out some
Her web site is here:
Home
The puppy page on her web site is located here:
About Us - you can click on each puppies picture to make it bigger so that you can see it in better detail.