if u tried it while looking into the mirror, u notice that the muscles involved are more than just modding the eye from open to close..... essentially the cheek will puff up, pulling up the tip of the lips while the outer ridge of the brow folds towards the eye. if u r going by the sculpey way, u would need to do major surgery to the cheek, lip and brow on the side the eye closes.
For a closed eye, you can just paint the eye over like a lid. Not all closed eyes are tightly shut.
I'm not sure what your project is, but if it's for an "aiming" fig, I'd like to offer some advice. You can take it or leave it.
Experienced shooters often learn how to shoot with both eyes open. Even when using optics. It allows a better overview of the field without missing any details/movement before, during, and after the shot.
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