I wasn't sure how a mirror would turn out so I got some cheap mirrored wall tiles for $1.66 at the big box store for a trial. 4w Emblaser pixel resolution .012, feed rate 130, 255 max. 2 passes. 4.5" x 4.5". PEP 5 with Pic Sender.
Back of mirror:
Front of mirror with back light:
Now, to try a full mirror background