Have you tried these on-line collections of Civil War photos?
The Library of Congress,
http://memory.loc.gov/ammem/cwphtml/cwphome.html
The National Archives:
http://www.archives.gov/research_room/research_topics/civil_war/civil_war_photos.htm
This site discusses the four main photographers of the CW era:
http://www.ipeters.de/photography.html
CW photos by Gardner, who worked for M. Brady before going on his own:
http://www.southernphotos.com/history.html
The Civil War Center at Louisiana State University has a
page of links to sites with photos:
<http://www.cwc.lsu.edu/cwc/links/photo.htm>
Steve Recker's Virtual Gettysburg:
<http://www.virtualgettysburg.com/exhibit/monuments/>
This commercial site has over 1200 civil war photos: http://www.picturehistory.com/find/c/289/p/15/mcms.html
You might also try the historical society or library of the county(ies) where the company was recruited. These local sources are probably the best source for finding regimental histories, dairies, photos of individuals, etc.
Hope this helps,
Alice J. Gayley
Pennsylvania in the Civil War
http://www.pa-roots.com/~pacw/