Very interesting Stan....It is a SWAG assumption the picture was taken in March,1862 just before his company went to war up in Arkansas.Prior to that was a few months service in the spring of 61 when the Texans chased the yankees out of the I.T. The only thing written on the back is Artist 21 in pencil.There is an outside chance it was taken somewhere in either Texas or Arkansas but not later then early January 63.
Merry Christmass!
Mike