http://tudorblogger.wordpress.com/2012/11/29/undergrad-dissertation-chapter-3-portrayals-of-anne-boleyn-in-portraits-and-literature/

The blogger (above) states that none of the portraits of Anne Boleyn are contemporaneous. Of the portraits that are probably of Anne, it is important to think about the purpose of the portrait or the political context of a particular portrait.  In any case, the blogger suggests that it is Anne's unusual, perhaps exotic appearance that attracted Henry; she was not a conventional beauty.