Heya,

Yup, it is definately your pivot point, you need to make sure that your pivot point is exactly flush on the edge of the one side of the face, and then mirror it and it should align properley, no matter where your head is in the scene, if your pivot is correctly placed it will mirror properley. Also, make sure all of your vertex's on the edge of the face are all in a straight line, that will also cause problems if they are out of place. Hope that helps

MainlineX