Hello! If I may add my two cents, I think that both the
Fly with me and the
Blue Elf tones work well. AND also the
Divinity Court Lucia ones.
While it's undeniably true that Fly with me is green, while Iron John is a sky blue, those colors are very close in both luminosity and saturation, to the point that, unless one zooms in a lot or has screen settings that accentuate the difference, I think they can look as a natural transition.
On the other hand, Blue Elf is closer in tone, but a bit darker and more saturated.
Just keep in mind that a real body is not unicolor. For that reason, details like a blush in the right color can make the head look more realistic. Unless you are going for a more "anime" style, I think you don't need a perfect match and actually a tiny bit of contrasts could make it look more interesting, especially with a skin like Iron John.