We are back to brown leaves - but there are many subtle colour variations
and most look green, even those there are only a couple of points where the a channel is negative!
Here is the saturation mapping (lots of jpg compression again)
Wow this is really different from the last painting
This Bilbauld is a lighter painting than the Allegrain, so it should be more saturated, if Dan's theory is correct. But I guess this is not a great master piece.