ok so this took me a while to make because i had no idea how to fix it. after a long brainstorm, this is what i got.
so the floating head on the left. i recolored the skin color by using a skin color from FE8, in this case Vanessa's skin color. i did this because im curious to know how much the skin color clashes or matches with the white hair color. and the floating head on the right, i did not change the skin color but it is where i attempted to fix the shading of the lower right hair section. i pondered about zelkami's comment on the skin, and i believed he meant the neck region because it looks odd now that i look at it.
as for the copy/pasted heads, this is me trying out how 2B's head would look like attached to other bodies without the black neck collar. Also, i trimmed her hair by one line because i have a hunch that one reason why she couldnt fit well with other bodies is due to her large hair. i just realized that i forgot to accommodate the hair band since the hair size got reduced.