Pastell and Prisma Skulls

Here's a couple drawings done on the same paper of 2 skulls the one on the right is closer to life size.
I drew this with pastels and prisma pencils.
These were drawn from medical grade resin skulls on a display stand.
The picture doesn't do it justice. I have a crappy old digital camera and the flash ruins most of my shots. Ill try taking better pictures whenever I get a new camera.