From Protector of the Grey House:
The doors were closed but he could hear voices. Joseph was standing in front of one door; hand on the knob waiting for his master to compose himself. Vincent stood for a moment staring at the mirrored door. He had not yet eaten; his reflection was slightly ghostly. A smile floated to his lips as he thought of the many vampires that had been unprepared for the mirrors. Not many of his kind had them in their homes. Vincent thought mirrors a useful tool against his enemies. He could tell if they had eaten or not depending on their reflection. Those who trusted him usually didn’t arrive at full blood. They knew Vincent would offer them blood. Those who did not trust him, almost always showed up full. Vincent felt they either didn’t trust the blood or didn’t trust him not to kill them. It made him smile.
Vincent stood before the mirror making himself look more imposing and trying to collect his thoughts. He was almost as tall as the door and his shoulders were almost as wide as the mirror. Using his fingers, he messed up his blond hair even more than it already was, making it look wild. His hair had been compared to a lion’s mane on several occasions, even though he usually kept it short. At the moment he was rather perturbed; looking wild was probably to his advantage.