Looking good so far!
I would say use the MYP color scheme. Even though the 4HM intended for her to have the 'classic' color scheme, the MYP one is the one most associated with that design.
Plus, while I hope we get a few versions of the Sorecess in MOTUC, I think that we all know if we only get one, it will be the classic/vintage look, with that corresponding color scheme. So, in that case you would have 2 Sorceress figures in classic/vintage color schemes. IMO it would be cool to have the 200X version have the MYP color scheme to make her stand out more by comparison.