If your piece is larger, like a poster or swathe of wallpaper, hang that on the wall first and frame afterwards, cutting away what falls outside the ... pieces with a faux matte or to fill out ...

A fine paintbrush is then used to detail the veins on the faux-marble wall. Depending on the area, it can take a few days for the plaster to fully dry. Then the wall is burnished to give it a ...