Your model may want her nose to look smaller. This can be done by tilting her chin upwards or having her face directly into the camera. Her nose will look shorter, since you are seeing it straight on. Lower the main light to shorten the shadow of her nose or lower the camera position to make the nose look shorter. There are some women that have a larger nose that actually enhances their appearance, so be aware of this.
Some people have problems with glasses, and the reflections they have.
This doesn't bother me, but you could tilt the glasses slightly forward by raising the back of the earpieces or move your lights to reduce or eliminate reflection. Your model can also raise or lower her chin. In extreme cases, you may want to remove the lenses, but this doesn't look natural. I hope this helps you with some of the situations you will encounter. One last thing.