Yes, it's here in the thread Peggy B started, "Compositional Sightlines".
http://forum.portraitartist.com/show...=&threadid=726
One of the very best foursomes I've ever seen is by award-winning Paul Newton. His single subject painting honored at the Portrait Society of America meeting this spring is here at
http://www.portraitsociety.org/2002/winners/newton.htm. He was recognized in some recent months in International Artist (I think) but unfortunately I couldn't locate him or this painting on the web, as this is where the foursome was shown.
I think you are in a complicated position, and I hope it goes well for you. In the past I have had a client who claimed not to care about likeness going in, but Wow! talk about tiny micromillimeters! Likewise I have found myself pressed into less than comfortable formats (only myself to blame), and have regretted each one. I now am much better at recognizing when I should decline a job. I think it is
extremely important to find out whether the client and artist have a good match, before ever starting down this road together.