In reply to jon:
> With regard to the Rose move, she doesn't seem to have to do it in such an extreme way as most other climbers I've seen on it with their head ducked under their right arm as they reach with the left. So why is that?
If you Google pictures of the route, many other people do it without the head right under the arm. The most notable exception is the famous picture of Wolfgang Gullich on it (who incidentally never completed the route).
Anyway the difference is how high you pull up and lock with your right hand whilst crossing - pulling up into a deeper lock gives more sideways reach, staying low gives less reach so you have to twist your head underneath your arm to reach further. The method is probably dictated by the footholds you choose to use (or vice versa).