Learning Intaglio

I've been silent for a few days, not much has happened, well, part from a glass bead level up and this:
training my Intaglio (reverse engraving) skills on 4 mm acrylic sheets. One was drafted (the one with leaf) and the rest was done free hand with various bits and a rotating engraver/hand tool.

Size of the piece is 5 x 4 cm, ca.
..Need to get some regular clear/white acrylic. and paint the inside of the engraving. And then try it on amber. Hell yes.