What kind of markings should a black and white Boston Terrier have???

Are they more expensive when they have a strip of white down the middle of their face??
Look at the pic of my female BT?? Does she have some type of deffect ?? I still think she is gorgeous!!

http://img03.picoodle.com/img/img03/8/5/...
Answers:
Wow! She is Adorable!! I love her ears... I don't really know about the breed standards, but she certainly is cute!!

If you are wondering about it you can always check out http://www.AKC.org or http://www.dogbreedinfo.com to find the breed standard, and to look at other pictures of Boston Terriers.

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What kissable lips you have, my dear . . . Don't know much about dogs except chihuahuas . . . sorry.