Faceups Making skintones look different with pastels or dye?

All those things work for changing the color of resin, the dyeing and the blushing or even painting it with acrylics (which might not be your thing). I never dyed any of my dolls before, so I don't have a lot of knowledge on that topic. However, I have always painted my dolls, including full body blushing. I have also painted OT 1:6 scale action figure heads, that are meant to be completely painted with acrylics to match the body you want the head to be placed on. Some of those are resin, so painting does work. Having said that, dyeing might probably be more resistant in the long run, than painting with acrylics or pastel, so in the end it would be your preference to go with any of them in particular, since they all work for changing color.

I recently got a smaller doll, so the blushing the whole body to change the color doesn't bother me too much, because I can redo the work in smaller areas quickly. I didn't used to mind redoing the work when I was younger, but now I've become a lazy old bum and rather not redo a 60cm doll, if I have to do the whole thing constantly. My newer tinier doll was available in resin choices that all seemed to lean towards yellowy tones, or super pinky tones. So, I went with the less yellowy and painted the body with pastels to look a bit paler, by going really heavy on the blues and purples, with some accents of reds. He's meant to be a ghoul, so I didn't want him to look completely healthy, but not too zombie-esque either, just a bit fantasy-esque, but definitely not yellowish, which is what his OG colored resin looked like to me IRL. Hope that helps a little and good luck with your projects! (:

Spoiler: My ghoul

He's MYou's normal resin, which is not as yellow as the normal yellow, but it's definitely not as pale nor white as their white. I just don't trust white aging that nicely overtime. DX You can paint a solid color with either pastels and/or acrylics, I just choose to do it in a shaded type of style, due to personal preference.

 

The "de zombification serum" is a joking name for a mix of dye. Dye is adding color to a lighter subject, so you cannot dye something lighter, but that mix could add peachy tones to the one doll yes.

Heavy blushing or paint would be the only way to go to lighten a doll's skintone, and I have used blushing to do that, to change the tone of a doll's face to match to a body or similar. You want high quality pigments like PanPastels, and it will take multiple layers to build up denser color, but it's doable.

Different tones in their blushing and faceups can easily make two dolls look very different, too.

I think for the effect you want, blushing should be an easy and doable way to get that result.