If you want to learn how to make particular colors or create realistic-looking shading and shadows, consider watching some free online tutorials. Have your sketchpad and supplies handy so you can pause the video and practice as the instructor breaks it down.  Peruse the comment section on videos because it’s likely that other artists have left some tips and suggestions. Search for tutorials in any particular technique you want to learn. For instance, you might find some good lessons on composition, working with light, cubism, surrealism, or even creating 3-D effects. If you can think of it, the internet probably has it! If you’re a beginner, look to local community centers and libraries for beginning art courses. If you already have some intermediate or advanced skills, you might consider enrolling in a class offered at a local college or art institute.  Taking classes is a great way to meet other artists and get some constructive criticism. To find local instructors, classes, and workshops near you, go to https://artcantina.com/. Workbooks are a great way to start if you’re a beginner or looking to pick up a very specific skill like figure drawing or cartooning. This is a great option if you have a busy schedule because you can tackle each lesson at your own pace.  You can buy instruction books online or at most large bookstores. If you rent an instruction book from your local library, don’t draw in the book! Photocopy the practice pages so you can draw on those instead. If you’re a beginner, look for instruction books that have traceable practice sheets so you can get a feel for it before practicing on a canvas or sketchpad. Beware of the "paint or draw by number" format—it can help if you’re an absolute beginner, but it may also hinder your individual style. Great artists are unique! If you want to learn to draw or paint particular things (like people, animals, and landscapes) or work with certain materials (like oil paints, watercolor, and charcoal) join an online artist community. Peruse the forums for...

TL;DR in Indonesian:
Tonton tutorial daring (online) gratis untuk mempelajari teknik, seperti memadukan warna atau membuat gradasi. Ikuti les privat atau bergabunglah dengan kelas seni yang berfokus pada keahlian tertentu. Gunakan buku instruksi kalau Anda seorang pemula atau ingin mempelajari keahlian khusus. Terhubunglah dengan seniman lain di internet untuk mengetahui tip terkait gaya dan bahan. Ukur kelemahan Anda dan perbaikilah.