So, I want ACT II to have a consistent, new hairstyle...and I think it should be ginger. It's sexy, it's bold, it's different...but not cartoony.
It also ties neatly into 'the phoenix rising from the ashes' thing and would work nicely with the lead single being a power ballad entitled 'Phoenix' about finding new love in the wake of a dead relationship. But also kinda alluding to her comeback. (She can focus on the former if the latter doesn't work out

)
Very Jean Grey.
(Forgive the speedy photoshopping)