Very nice - your best one yet, in my opinion! I particularly like the hands.
The only thing I'd suggest is to carefully check the shapes of the mouth. Her expression in the painting looks much more unhappy than in the reference.
Part of that has to do with the fact that the vertical indentation that comes down from beside the nose is too dark and too long, but mostly it has to do with the very precise forms of the lips. It's a subtle but critical thing. I've repainted mouths five times or more to get just the right expression.
|