These images may look like a strange way to start a figure, but in some situations we do start roughing out a figure in pieces rather than as a whole.
The decision was made, in this case, for a couple of reasons. Reason one is that the drawing was pretty specific and we were happy with how it looked on paper. Having a "blueprint" like this allows us to jump in on a figure quicker than if we were figuring out proportions as we went. Although this gives us a quick start on the figure, the proportions will continue to evolve as we see how the figure works in three dimensions.
The second reason for starting the figure in pieces is that it removes a lot of the time spent cutting up the figure and making the articulation work. By working in pieces we can lay the groundwork for the articulation points as we create the shapes of muscles and forms so that they work more seamlessly when they move. If we didn't have a fairly tight drawing to start with this would not work quite as well because again, we would be working through a lot of proportion issues blindly.
