GREAT BIG DISCLAIMER: I am not going to do face re-paints of any dolls except extremely common, usually valueless ones. Certainly not of any vintage dolls.
Now then: If you aren't sure why anyone would want to erase the face of a doll and completely repaint it, try a google image search on "doll repaints" and you will see about a thousand reasons.
But here is one of them. I own a Gene doll exactly like this one:
And I like her all right... But truthfully, that eyeshadow and those grey brows don't do anything for me. I bought her because she was on close-out and she has a fun shape to sew for. She's in a box in the closet right now. But wouldn't I just be over the moon, wouldn't I just have her out of that box and on the sewing table, if she looked like this instead:
Gene dolls can have countless different looks depending on the style of the artist. It's going to be a long time before I attempt a face repaint of Gene, and if I turn out to be no good at it, I'll never attempt it at all. But she is my inspiration...along with a tub of old Salvation Army Barbies.
Technically, Gene is collectible, but she is not at all rare. I am confident that there will be plenty of original-face Genes for future collectors to acquire if they would like to.