your proportions could use some work. The reference you have is of a person who is very top heavy with thin hips. The drawing you have shows someone who is long and slender with not a lot of muscle mass, in face it seems to flare out at the hips a little.
It seems like you were trying to study the second reference, but rather than putting the hips back in space and foreshortening, it appears that the shoulders and hips are the same distance from the viewer and the spine has been elongated some.
You're picking interesting reference, but I would advise trying the drawing again while paying closer attention to the photos and worrying less about the specific bones for right now. To be honest, learning anatomy in that sense can be interesting... but unless you're going to draw skeletons a lot it's more important as a cartoonist or illustrator to be able to do convincing drawings of people with their flesh and skin affixed.
