My brother Nathaniel and I have taken a new direction with our collaborative work, this time dividing the canvas into discrete sections within which we do our respective work. We're taking turns posing for a half-an-hour apiece while the other person paints. In this way, each person is involved throughout the entire process. If you haven't posed for someone in awhile you would be surprised how long a half-an-hour can last- evidently not long enough for me, though, as my brother is clearly a faster worker than me at this point.