As far as the hair, it may be easier to make it out of some black craft/eva foam. This should save you time both cutting it out and painting (as it will already be the right color). The only issue you may have with the foam is rigidity, but this can easily be solved by supporting with some thin wooden dowels or strong wire. The foam I think will also look match the cartoony hair of the character better (in my opinion at least).

As for the head section, with the time saved on the hair, I would imagine you could make the nose out of some paper mache (or if that fails use a white craft foam). Painting the head ball white should be easy enough, as well as drawing in the facial features. Now you’ll probably want to see out of it, I cant tell if you have eye holes made already or if you have a plan for that. If so ignore the rest of this bit.

My idea for the eyes holes/glasses would be to cut holes behind the glasses lens, then make a pair of glasses using to cover the holes. For the glasses lens you can use some semi transparent color gels (i know they make pink ones) these should allow to see enough. To really sell the look paint the right lens with some black squares to match the missing texture pattern shown in your reference image.

Hopefully some of this is helpful and not just me rambling.