It would of been much more frightening to me if it where more subtle. Like the girl in the mirror blinking out of time, or a something noticeable slightly displaces in the reflection. That's my own opinion.
Hmm that's a good idea but I thought it would be better to not look at my own reflection as though it could disappear at any moment and I'll never know it was even there. I may try one that's slightly more subtle though ^^