After describing yourself, you can express yourself with a famous aphorism or poem, and the most important thing is the benefits brought by reading.
Finally, you can make a summary for yourself. For example, I am cheerful and helpful. Here, I describe my personality and behavior. I am a teacher's little assistant and a good friend of my classmates! I regard reading as a great pleasure, and reading before going to bed every day is my homework. See the world in books and understand the truth in reading! Reading gives me pleasure, and I swim happily in the sea of books! Finally, it is to show determination.