using life drawings in a large painting

This is a painting that is certainly not painting itself, but am enjoying the challenge of trying to juggle lots of ideas and experiments at the same time. Beginning with a life drawing I painted over another painting that had been painted over another painting.  If I think about it I can see traces of each. Somewhere along the way I decided the nude needed some clothing.  I will go and do a colour study and see if I can figure out what colour I need on the cloth over the chair and then I will decide about the shape of the clothing that it needs to become... I also need to find the life drawing that I filed somewhere and can't find so I can think about those feet.