Lee, Sonya posted this link on one of the show threads:
Seminar on the Yorkshire Terrier
I am sure you have probably seen some of these examples before at to what a proper Yorkie should look like. You will never find a perfect Yorkie but you should try to find one with no more than 2 faults if possible. To me though a silky coat is a must. You can have a yorkie with perfect conformation but without a silky coat it would be very difficult to ever win in the show ring.