Βασικά σχήματα
πηγή: https://www.easydrawingtips.com/wp-content/uploads/2018/08/three_dimensional_shapes_shaded_drawings.jpg
πηγή: https://drawingacademy.com/images/drawings/How-to-Draw-Objects-4-3-by-Drawing-Academy.jpg
πηγή: https://i.pinimg.com/564x/be/54/aa/be54aaec67a2cb9bfec814e7dbdbffb0.jpg