Only the Dragonborn may slain a dragon as he is the one born with the blood and soul of a Dragon.
This dragon bone skull model here is made based on The Elder Scrolls V: Skyrim video game where dragon is the most powerful being that once annihilated humans off the earth.
Every time a dragon got slaughtered by a Dragonborn in the game, what remains after is just dragon bones and skulls. The skulls then look exactly like this model we have here.
Dragon bone skull paper craft requires 47 sheets of paper to build, the scale is 1:1 . The model is designed by ZombieGrimm from deviantart. Featured picture is a finish model of Dragon Bone Skull by distressfasirt.