Black and White Pencil/Charcoal Drawings

The following test pictures were taken from http://www.pcpop.com/desk/index.html (Chinese Website)

1.

Original Image at http://www.pcpop.com/desk/76084_23757.html
2.
Original Image at http://www.pcpop.com/desk/75621_15715.html
3.
Original Image at http://www.pcpop.com/desk/91492_203994.html
4.
Original Image at http://www.pcpop.com/desk/92278_222569.html