Do insect's eyes maintain their color after they die?

I am trying to preserve a female cicada (from Brood XIX) in resin. I only had her for a few hours before she died and I have been keeping her in a tupperware container in the fridge since then (only a day and a half), but I noticed that her eye color has almost completely faded from bright orange to dull orangy brown. I read somewhere that the fridge would help preserve the color, but it doesn't seem to be working. I was wondering, is it even possible to maintain a life-like eye color after an insect dies? Or is there maybe a way to bring it back (i.e. injecting with water or something)? I really hate to put her in the resin looking like this, she was much prettier alive...I would have preferred to keep her that way, but now I can only do my best to preserve her original vibrance.