I agree with all of the above. You really can't see your full results until they are older. So I would also suggest shopping around for a puppy that is closer to the 6 month age range. However, I realize that it's hard to find one that's in that range. Another great link that I found very helpful was the new standard link:
http://judgesl.com/YORKSHIRE%20TERRI...%20Terrier.htm You should be able to see these things in the puppy as well.
I find that the coat is the hardest thing to judge in a puppy. I'm still working on knowing the puppy coat and how it will turn out as an adult. I think that that is something that will come with time.