I've been told that the two images to the left are Daguerreotype photos. These two people are unknown, but the photos were passed down from Daniel T. Watkins line, a branch of the family that lived in the Winston-Salem area of NC.
Old Salem, NC had its own photographer and developer when Traugott Leinbach bought his first set of photography equipment for as little as $125 from a traveling salesman in 1845. He began producing Daguerreotype photos. He opened a photography studio in 1854 and ran it until 1860 when his wife became ill. They moved to Pennsylvania, and his nephew, Henry Alexander Linebach took over. He changed the spelling of the family name.
The last photo of a child sitting alone is a Tintype of my 2nd great-grandfather, Michael Clingman Harris. We know it is him since his name is carved on the back of the plate. It also attaches to a magnet. He was born in 1865. Knowing his age, as well as his mother and sister, we can safely determine that the photos were taken about 1869. They lived in Wilkes County, NC, and although they were within driving distance of Salem, NC, I do not know where these images were taken.
eHow.com, How to Tell Tintypes from Daguerreotypes