If I may chime in on a slightly different mirror-related issue -- always place your mirror so that the light source will be shining on the object to be reflected in the mirror (i.e., you) and not on the mirror itself.
For example, if a room has windows on only one wall and you position your mirror opposite the windows, your reflection will appear to be in silhouette and you won't be able to see details clearly when you look in the mirror. If you position your mirror so that when you look in it, the light source is behind or to the side of the mirror, instead of behind *you*, you'll be able to see your reflection much more clearly.
Does that make sense? You'll notice on the forum that photos taken with the light source coming from behind the reflected person appear dark and hard to make out. Always put your best mirror where the light can fall on you rather than on the glass.