I personally prefer that Luna skin color and hair color stays the same even when she corrupts.
But talking about the status page of Luna, theres an interesting idea that i think would fit this game a lot.
We already know that on lunas status page there are separate cgs of each part of lunas body. (lips, boobs, and others) and those images change to a blurred cg when vargas is doing something to her (mostly in the protagonist pov), but im talking about the default images like the ones you see down below.
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The idea is that these luna images change alongside her corruption, following slight but visible changes of Lunas body as the story advances (for example that Lunas lips cg changes into her doing a lewd expression with her tongue out or that some of her body parts becoming slightly thiccer), this mechanic is used in many corruption related games, and in some cases even the full body standing cg of the character also changes alongside the corruption, heres some examples down below so you can understand what i mean:
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There are many different ways that a lot of games represent the body changes during a characters corruption, some examples of them are: (the skin covered in cum, body writing, used condoms, wetness, sweat, her body getting slightly thiccer the more she does sex and lewd things, the list goes on...)
I believe that this mechanic in the status page would make Lunas corruption even more enjoyable than it already is, and i hope it gets added somehow.