Hello Artie,
It would help if we could see the eyelid that is not working, but as a general comment on what you are trying to do you want the shape to be a bit like a foot ball.  What you could do is take the what ever you are using for the eye i.e. a ping ball and cover it with painters tape. Then slice tape in quarters.  That would give you a starting point.  This quarter piece may not cover the eye enough when you close it so sew to quarters together... this gives you your "darts". Most likely you won't need the full dart this would make but it should give you an idea of what you need.