Shadows appear on objects in areas where the lighting is blocked or indirect. Before creating shadows it is important to choose a direction where the light source will come from. There are two main shadows that are typically drawn – Sunlight, and Cast shadows. A cast shadows should be big enough to emphasize the shape of an object, but it shouldn’t be the main subject in a sketch. It also brings an illusion of depth to your sketches. Keep it simple and fast. If it looks good and the object is in the main focus, then you have done it right.