I just went and followed the two links you posted Gem. It is interesting much attention the eyes require. In all three images you posted, the eyes were mentioned as the biggest problem.
Getting the eyes perfect requires some practice and sometimes decent PP work. It is what people like to see.
For me, they eyes only need to be as sharp as your story needs them to be. In all three images, there was a story behind sharp eyes.
Again, just preferences here.(I think I just repeated myself)
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