Description of Cho Chang

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No: HPFGUIDX 45463

Has Rowling ever described Cho in her books beyond being "pretty"?  I 
think it's odd that she goes into such detail on other charaters 
(i.e. hair/eye color, etc.) but has given us nothing on Cho.  Is it 
implied that she has Asian characteristics?  Is she waiting until Cho 
is a more prominent character?  Or is there something secret about 
Cho that Rowling doesn't want to give away just yet?  Maybe she's 
related to someone and looks like them?  Any theories?

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