www.copleysociety.org
Terry, they have a portrait division. It is a society that you have to be juried into in Boston. It costs about $35 for the application process. The dues are $125 a year and the DO get you commissions. It is 30%.
The Vose Gallery (
www.vosegalleries.com) in Boston also represents portrait artists, but you have to be very established. They take 30% also and are exceedingly old school and gentlemanly to deal with. Their stationery is genuine engraving. WHOO WHOO!