Thanks for sharing the great foto with us.
I can't add anything more to what I have already commented on.
Hopefully someone will either agree or disagree with me and add more information to this.
Many thanks what means the 's' on this aircraft perhaps school unit???
That makes sense to me as there is also an "S" on the fuselage on the next plane. With everyone gathered around the front machine it does give the impression of a schule.
The next machine is a different make and model. The rudder to the right side appears to be another Albatros B.II.
There is a more certain attribute that confirms that this photo is taken at a Flieger Schule... namely, right under the tail it clearly gives the name of the Flieger-schule, which confirms it to be Boeblingen.