Misty – we use the program asked about in the original post — Mark Kistler’s Online Art Academy (which includes 3 streams: Art Academy, Mini Marshmallows and School of Imagination). I bought a year’s subscription from Homeschool Buyers Coop (http://www.homeschoolbuyersco-op.org/) and we just love it. 🙂
eta that we also have The Drawing Textbook and think it is excellent, too.