Trying to not keep the drawings flat.
The figure on the right suceeds in not being flat and showing the action of the figure. The fig. on the left is OK but the legs are too long for the upper body. I would recommend you start with a stick figure once you have the general action of the figure. The shoulders with the head (remember it is a skull) placed in a correct orientation. A horizontal line representing the hips/pelvis oriented correctly. The legs in the left drawing are the same length, top & bottom, if you are looking straight on. Recommend you look for other sources to study anatomy and proportion for the body. Also, practice, practice, practice. You will find with practice, you will get better.