Tạo bản vẽ phác thảo. Tìm nguồn ánh sáng. Cân nhắc việc sử dụng màu sắc. Quan sát sự chuyển động của vật thể.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Use a hard pencil to create a light sketch of your subject. You can do this directly onto the canvas or onto tracing paper, and transfer it using a carbon copy. When you’re drawing your subject, keep in mind the composition and use of negative space.  Composition is the placement of items on the canvas. Choose the best placement so that the eye is drawn around the entirety of the canvas, rather than left to linger on a single spot. Negative space is the space around an object. If you are using a