Hi printix, mirrors just reflect the unseen room behind the viewer.
You can just use some vector shapes to create mirrors.
I found this white Dove which I then copied. I rotated the copy. I placed them on a "wall" type background.
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I then added a drop shadow and a gradient overlay using layer styles.
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I then found an appropriate "reflection", transformed it to the right size and the duplicated it. I moved a reflection layer above both the dove layers and then added a clipping mask to the reflection layers clipping them to the dove layers.
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Hope this helps!