Not bad. Our teacher recommended us to use this set of books. I bought the perfect teaching head and gouache myself. The sketch didn't buy it. I don't think so. This series of books has perfect dialogues and so on. He has done many designs and so on. You should find everything you want to see. Might as well buy those college entrance examination items. Buy a big photo. Although headshots are not suitable for copying, do you know why? Because they were all painted by students. But perfect teaching is very good no matter which one is explained above. I believe reading the above explanation will be of great help to you. I don't know about other studios, but they should all be quite basic. Our information is limited and we don't know much. You'd better ask others more. The above is my personal opinion. It's best not to buy it. It's so stylish.