Gouache paper has its unique texture and strong painting style. If the sketch relationship is handled properly, it will appear very distinctive, but it is not recommended to use it for a long time. A better brand of sketch paper is "Old Man". This kind of paper will not be worn off, and it contains lead, which is better. In fact, what kind of paper is second. Sketch is the knowledge of dealing with body shape, and it is the basic knowledge. What can be drawn can be drawn well on post-it notes. But for beginners, it is better to use popular paper. The paper identification method that can be used is to paint it with 4B pencil and 7 ingredients to see if it is lead.