Skull based on the book of William Cheselden: Osteographia, or The anatomy of the bones.
Published originally in London in 1733 by a surgeon named William Cheselden (1688-1752).
His artists, Gerard Vandergucht and Jacob Schijnvoet, employed a camera obscura to achieve the highest accuracy. He also contributed by setting the poses supervising anatomical correctness.
This clipart is a remix from:
Skeleton Prays
by @j4p4n