Same eye but two different lightings. I don't think it made much difference because I had flash on but let me know what you think. Top on is in a dark room with just a little light and bottom on is in a well-lit room.
This was actually inspired by Septiceye Sam, the Jacksepticeye channel icon/mascot! I'm scared to take a screenshot to post, even if I delete it afterwards, but basically the lighter, brighter green is
WARNING, THIS WILL SOUND A LITTLE GROSS
The fluid of his septic tank (in Jack's outro he does a little dance in it, it's adorable), the darker green is him because he's got green instead of white, and the blue is his blue iris. I would have tried a little back in the center but I don't have any black eyeshadow. Next thing to buy, shadows with more neutral colors.