I'm puzzled
why silhouettes?
why not just use the tried and tested "from the left" style used by newspapers?
inevitably in group shots without detail the group becomes a "cloud" of lumps - unless the pikkie was taken specifically for that purpose.
If that's the intention beso's last thought on mapping would be effective ... you could even use the map to reveal the name when the mouse pointer hovers over an individual
there are some quite effective examples here
http://www.dynamicdrive.com/dynamicindex15/ind ex.html