It is best to find a mentor - even if you can't find a Yorkie breeder at least another toy breeder to evaluate your dog. Those two pictures while nice are not near enough to evaluate a dog long distance. I would need to see free stack photos, movement videos - suspended stack etc. I do like his coat coloration - how ever his face is very light or at least appears so in the photo.
Showing a dog can be a lot of fun - but it is also a lot of work too
Let me know if you have more questions and I will be happy to help.