But whether you are out of your own hobby or want to pass the formal exam, I suggest you communicate with professional teachers or friends, so that you can enjoy it quickly and well. Because of the wide range of fine arts majors, things like sketching and gouache need long-term study and accumulation to be more perfect. ?
If you are an amateur, you can buy some related books to read, or you can discuss with friends to find knowledge points. Hehe, you will feel it after a long time. ?
If you want to pass the formal exam, you must refuel. For example, a sketch of a character's five senses is shown below. The relationship between light and shade and the direction of brushwork is the key to drawing a good picture, so you should teach yourself at the same time, so you should go to a cram school or listen to a professional teacher. ?
Make up your mind that you can do it and believe in yourself.