Hmmmmmmmmmm, The markings sound Ok if your not going to show or breed.
The overbite, I'm not sure about. I'm sure we have some great answers on this site. We all fall in love with Yorkies, when you are getting a new baby, go with your gut, trust your instincts, because I'm sure there is a baby out there for you. When I found Princess, She told me she was the one.
Good Luck! Let us know when you find your new baby!