These are three variations on how you can achieve light/white hair on your stamped images. Whenever I want a character to have 'white' hair I think about what kind of environment they are in because the colors around them would be reflected in the white hair which determines the color of shadows and shading that I use to add dimension to an otherwise flat look. And it can be any color you want, just so long as you stick with very light shades of that color and leave a lot of the white cardstock showing. (Edited to add, because I forgot to tell this in the video.)
The finished card with Seraphina can be seen here
The finished card with Aurelia can be seen here.
The finished card with Celestina can be seen here.