So here's the piece as it was hanging on the wall before I started the refurbishment.
I carefully prised open the box from the frame. Then I cut two side shiny card pieces to fit onto the edges.
I sculpted the sitting boy figure to add to the scene.

Finally, I've completed this. The figures and parts were reassembled and I added a thin cutout frame to mask off the edges. The glass sides certainly make the scene roomier and brighter. Thanks for looking.






