Half-scale human brain and half a skull model from Skillcraft.
White paint is a Tamiya white primer. Brain flesh and blood is Vallejo acrylics and some sepia wash, with a gloss coat of Future Floor Wax to make the brain shiny and give it a wet glossy life-like appearance. And I added a gold tooth for extra flash.
I bought it at a flea market outside Ottawa. I sold it to a woman whose daughter was just finishing her neurology residency and Mom wanted to make it the centerpiece on the dining table. I could appreciate that sentiment.