I think it is fabulous that you are exposing the kiddos to different types of art at a young age. What I remember from public school was that there was a "right way" to draw or paint or whatever. To this day, I am blown away when I see an artist who has explored something that I could never have imagined...be it using an unusual medium, abstract representation, unique display, etc. The more your children can be exposed to "out-of-the-box" thinking and creating, the more awesome they will become :)