Before casting. It says a lot how close the sketches are to the actual actors cast. That’s not because I can see the future, but because I am a fan of the book. I drew what was in my head, which I think was a fairly good approximation of what Diana wrote (except Dougal as Ron, of course). When they cast, they got pretty damned close. Certainly as close as could be expected. Lotte Verbeek IS Geillis through and through.