Many times the features of the face are less symmetrical than we're led to believe. The mind tells us one thing and the eyes another. Trust the eyes.
If you concentrate on first getting down the things that are the most critical in terms of placement before the model may move, then it won't matter as much when she does. A few quick lines to get things in their place is often all you need. After that, the model is more a reference than the source of literal copying.
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