Vidar3d,
Wow, once again I am hugely impressed with your progress…this colorized version is lovely, and the attention paid to the tonalities of the background drapery as it relates to the foreground figure is quite nice…I also like the well~handled shift in perspective from the top of the figure to the feet…all~round, this has progressed beautifully! :applause:
The one minor crit I would have would be for her right arm and hand…which look a bit more flat in comparison to the body and face, which appear quite volumetric. The shadow area around her right shin might also be lightened with just a touch more reflected light to distinguish her leg from the background…but apart from these minor things, I think overall this is a really nice piece, and I look forward to seeing what you will do for the next! 
Glad the information re: opposing curves / chiarascuro was helpful. Thanks to audit for the really good question! 
Regarding using oil paints for the next OFDW ~ you are more than welcome to do so! I think it would be great to see that here ~ a few people have done that in the past, and I certainly wouldn’t mind at all if more people did so.
The structure of the OFDW series is really based on my recollection of the live painting and drawing Workshops I attended in school, and there of course we were working traditionally (though the term ‘of course’ may not apply today :)) so I am more than happy to see Traditional work done here for these OFDWs. The only concern I have is time, but frankly, in school we were given about the same amount of time to do Master Copies, so it shouldn’t be too much of a problem…the goal is to understand Drawing, Composition, and Color, and not to produce a carbon copy of the original ~ so I would definitely encourage you to go that route if you feel so inclined. 
Cheers, 
~Rebeccak