Tim's, Tom's and Michele's follow ons reflect many of my own thoughts. I'd better leave my posthumous portrait of Benny Hill alone then!
It seems one's own portfolio will determine the style of commissions received so that would be difficult to change if one wanted to.
There is The Royal Society of Portrait Painters
www.therp.co.uk I believe Sargeant exhibited there, if you wanted to see what's going on across the pond. Although there are no forums like here.
www.commissionaportrait.com is another .
The major plus here is you all help each other.
Regards,
Aldo