Flora Priestly, after Sargent.
I do know that I did a very bad version of this back in 2007 - I have it in the sketchbook. But, apparently I never posted it. Trust me, this one isn't great, but it's better.
These portraits provide a good challenge:
- getting the shapes right the first time, no drawing
- practice fixing the shapes when they are wrong the first time
- practice controlling hard and soft edges