Use a subject that you are best at, for example, your portrait painting is good. First, give this class a painting evaluation class, spread out the exercises of the whole class, teach students how to evaluate painting, let them master the ability of reviewing homework, select some for you to evaluate, and let the students evaluate the rest themselves, so you can save the time of making a demonstration on the spot. If you don't play well for a while, the consequences can be imagined. In short, if your major is not good, I advise you. ! !