The  picture from the Shumen camp # 1- made in March 1944 ( Courtesy of D. Evrov)

In the center of the picture is the commandant of the camp - 1st Lt. Dragomir Evrov. The picture was made with Evrov's camera .

L to R

The second is Ivan Corosa ( advised by Ivan de Grisogono and Aleksandar Kolo)

The sixth  is 2nd Lt. Edward Tinker ( advised by his son Mike Tinker)

The third  probably is Julian Darlington - representative of the prisoners of war (the identification is to be advised)