My collection of scans & info. on Karen Brennan is pretty patchy but your pics. of KB as Esther, with the Peter Flodquist credit, are from High Society (De), 1988-07,
here.
Related pics. from that set were in Cheri, 1988-07, see
here,
here. Unfortunately no photog. credit is shown.
Likewise related pics. were in High Society Busen Spezial (De) no.901,
here, date unknown and again photog. unknown.
More pics. from that setting
here,
here but photog. uncredited.
One of the pics.
here looks identical to yours, but full mag. info. not given or photog. credited.