Female nude - back. Imprimatura

This is the first layer - obtained by using Raw Sienna and Titanium White with a medium of 1part stand oil and 6 parts turpentine.
I used a large brush, and then the fan brush to even out the brushstrokes.
It took 2 weeks to dry.
This was applied onto an extremely smooth board (mdf 5mm sanded to death and with 5 coats of Gesso, each sanded smooth - last sanding performed with wet & dry sandpaper).
The result here isn't interesting at all - the real thing though is already something I didn't see before, it has a really beautiful translucency. I might have to get a proper camera - for now I have to rely on the phone pictures... not exactly ideal.