Is there life beyond oil paint?

As much as I love oil paints, I have to say it is hard to work on after I get home from 11 hours a day of working and commuting. I'm trying to find a new method of working that might not be faster, but is easier to work on and clean up after the day job. My experiment here is a quick little sketch with graphite and charcoal, and then painting on top with watercolor. So far it's working out and I think I will even try thin layers of oil paint on top...