In the reference photo you posted the Dad's blue/green eye is much less saturated in color and is shaded quite a bit more than you have painted it. You have also drawn it more wide open than it is in the photo. (The upper eyelid arches up too much.)
Fixing those things will make the difference less apparent -- unless of course you WANT to emphasize the difference in eye color. If that is the case, it will become the focal point of the painting.
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