My first mirror, but not very well reflecting

[jazu]

I purchased my glass from @Goldjunge_Chriz for some time a go, and got it to wall just now (couple of years later).
I am happy with how the SW side works and is easy to code, but the mirror is not reflecting very well.

I have couple of pictures above showing the reflection with and without ceiling lights on. The small makeup mirror is below for the reference.
Any ideas what I have done wrong? I have few weeks time to fix it or it will be replaced by Ikea mirror :confounded_face:

I have plywood back ground (against the glass) which I sprayed with mat-black and no light should get behind or sides to the glass.

https://www.dropbox.com/s/evand929hewdqod/20191111_071511_720x1280.jpg?dl=0

https://www.dropbox.com/s/ekf7iqsr0j57pr6/20191111_071940720x1280.jpg?dl=0