When creating an animation, we must ensure that the character is a three-dimensional shape in a three-dimensional space. Therefore, animators should pay more attention to the character's volume, weight, and sense of balance.
Volume and Weight
The volume of the object includes structure, skeleton, and perspective. When sketching, you can try to use spheres, cubes, and cylinders to get the three-dimensional sense of the characters.
Image credit: Camlin Kokuyo Blog. The blog offers a lot of interesting art ideas!
Try to draw lines on the characters that overlap the structure, such as the part that is covered when the joints are bent, or the wrinkles that occur when clothing is overlapped. Separating the front and back of the object; characters without overlapping can easily look flat and flat.
Try to avoid upright symmetry as much as possible, excluding special circumstances. Perfect symmetry can easily make a character appear rigid and boring, and lose the sense of three-dimensionality.
Source: The Illusion of Life: Disney Animation by Ollie Johnston and Frank Thomas, published by Disney Editions
Check the video tutorial made by Jizza, "How to draw the Human Figure - Body Construction tutorial"