I feel you have an overall good understanding of the eye structure and how to apply it to your style. However I think you should focus on the variations and distinctions in each eye lid and the expression of the brows. All the photos you showed show a raised brow almost as if you avoid showing it furrowed and wrinkled. Practice on that and I think you'll like the result. Don't be afraid to apply realism in certain areas even if you are going for a semi real look in your drawings. Hope this helps!
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