Yes, I have seen that particular pose reproduced somewhere before. It was common to take several different photos during sittings, so it's always possible to discover a previou
sly unknown one so you are right to wonder.
About your most recent ones, of course Maj. Gen. William Rosecrans is identified and the others are also known "personalities" too. The civilian next to him is Judge Joseph Holt, a crony and employee of Edwin Stanton's at the War Department - Holt was one of those responsible for the prosecution of such "war criminals" as were tried after the war like the Commandant of Andersonville Prison Capt. Henry Wirz, and the so-called Conspirators in the Lincoln Assination. Below them are two naval officers, at left Admiral David G. Farragut; unfortunately, I don't recognize the one at right, though it *may* be Samuel F. DuPont - but I'll bet
@AndyHall or
@Mark F. Jenkins will!