Exactly the same process with this 12" x 12" piece of mdf board and modelling paste.
A coat of tinting base.
I used the media sprays for the background, drying inbetween different colours.
Using sand paper I sanded back over the modelling paste.
Flicked on some white chalky paint.
Outlined the stencil and filled it in again as before.
Placed the stencil back over the image and used black gesso through it.
Added a word and some numbers through a stencil and outlined with white Posca pen. Outlined the edge with black pen.
And taken outside which reflects the true colours.