Oil paints. I've not used them for about 8 years so opted to make it easy for myself and try them out with a straightforward dragon portrait. This picture's gone through quite a lot of changes which you can see for yourself here:
To make it even easier I made it a monochrome, so hello Payne's Grey (<3) and Titanium White...
... I lie. There's a tinsey bit of Zinc White in there too.
My scanner hated this one.