That's a shame about your art teacher, rubah. Was she your AP Art teacher? My AP Art teacher was really adamant about finding your good medium and sticking to it, so that you get really good at your portfolio. Most people basically stuck to one medium, whether it be paint, pastel, colored pencils, etc. I think mine might have used the most different types of medium, because I used oil, chalk, and water color from oil pastels. xD But they all were in the same category.