Continued work on the Teatro Signorelli tray (unfinished).
I painted "white slip" (a soupy white clay mixture) onto the surface and worked back in with a carving tool.  When the clay is fired, areas with the white slip will be very pale in contrast to the darker terracotta.  This makes it it easier for lighter glazes--like the turquoise I am planning on using--to show up.

Duomo Cathedral bowl (unfinished).
I added the clay stars and applied more white slip...