i think tall girls (like Hana or Tiiu) totally rock! i mean, aren't models supposed to have something unusual about them that makes them stand out? for some people it might be a particular feature or body part or different hair color.... and height definitely counts as a unique feature it's their extra height that makes them more uniquely beautiful and magnificent!
plus, in my opinion, i think its really cool when already tall girls wear heels- it shows that they are comfortable with being tall & that they know how to play up a feature that makes them stand out (everyone tries to "play up" what they've got: if you have a nice bosom then you wear tops that will flatter them, if you have great legs then you might wear short skirts, if you have pretty eyes then you might curl your eyelashes or wear dramatic eyeliner......... everyone does things to bring attention to their special features. so if a girl has height, then she should feel free to show it off by wearing heels that make her even more noticeable )