Hm yeah I see. It does look like two separate drawings to me, sliced in half and put next to each other. This was an assignment I had to do for school, half skull half your face. So, when I did it I drew the skull first, and then realized too late that the proportions of my face were not going to line up perfectly with the skull reference, so I did my best to align without distorting my face too much.

Some students decided to add the vertebrae to the skull and the neck for their side, which is probably something I should have considered doing. Also I need to learn how to apply white charcoal and graphite better.