I managed to document my CG drawing steps in drawing
"Bond", a Dean/Cas fan art ^^
It was quite tiring. Doing this while drawing something simultaneously made me lose my patience much sooner than usual( ̄へ ̄)
So here it is, the drawing process. It's a bit large, and pardon my English (;´ρ`)
EDIT: More drawing steps & techniques
here @ SPN Roundtable