Both articles are possible. There is a subtle difference in feel, but no real tangible difference in meaning.
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ReegisThis is interesting...Remember that a modifying word or phrase, in this case "on her face", often licenses us to use "the" even at first mention. The following is not possible (or is at best unusual style):
GPYRemember that a modifying word or phrase, in this case "on her face", often licenses us to use "the" even at first mention.Ah, it explains a lot!
ReegisSo to sum up we might have:a) First mention - use an indefinite article.b) Second mention - use a definite article.c) Later mention - use a definite article (make sure it identifies the object as unique).But keep in mind that exceptions exist. It is notoriously difficult to explain article usage using simple rules in a way that covers every eventuality.
GPY. It is notoriously difficult to explain article usage using simple rules in a way that covers every eventuality.I'd call that an understatement.
fivejedjonI'd call that an understatement.I still do remember how you once commented on how extremely difficult it might be...