Drybrush stage. Mostly pure paint with a teeny bit of spirits.
Ebauche, paint thinned with spirits.
Start of first painting. Only pure paint.
Finished painting. Final layer painted with meatium. Get it? MEAT-ium?
Dave likes to juxtapose more highly finished elements (in this case, the wood of the shelf, the handle of the cleaver) with broken and atmospheric elements (the background and any objects in the background). The contrast adds significance to the detailed areas, and the broken and atmospheric elements recede in space and create depth.