In animation it's fundamental to be consistent in the structure and volume to avoid deformations and movement mistakes.
Điều khiển âm lượng và cấu trúc theo phối cảnh, góc camera và hành động
Điểm rất quan trọng
Khi vẽ bạn phải tạo các đường phối cảnh ảo theo vị trí từng bộ phận của nhân vật.
Those lines don't have to be drawn, with experience, this construction will be only in your mind... But you must give the habit to your eyes to see in 3 dimensions and understand the volumes in every direction.
Practice the construction, volume and perspective of the body with life drawing sessions or directly from photos. Try to understand the volume, even for the hidden parts.
Design by Otto Schmidt
It's a good exercise to use photos or videos references to practice volume and construction.
In slow motion
OTTO SCHMIDT
This video is also in the animation page, but the approach of Toniko Pantoja for the first rough is very interesting for our construction topic here.